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"CONTROL AND COORDINATION" science NCERT notes

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Control and coordination in organisms are vital processes that ensure the smooth functioning of body activities. In animals, the nervous system and endocrine system work together to regulate bodily functions. The nervous system controls immediate responses through electrical impulses, involving the...

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  • August 27, 2024
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  • 2024/2025
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  • Prashant kirad
  • Class-10 science cbse notes control and coordination
  • Secondary school
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1.

How do the nervous system and endocrine system coordinate in maintaining homeostasis? This question explores the roles of the nervous and endocrine systems in regulating body functions, emphasizing how they work together to maintain balance within the body.

Answer: The nervous and endocrine systems play a crucial role in maintaining homeostasis, the body\'s internal balance despite changes in the external environment. Although they operate differently, these two systems often work together to regulate bodily functions and ensure stability. Nervous System and Its Role in Homeostasis: Rapid Response: The nervous system responds quickly to changes in the environment by sending electrical signals through neurons. These signals travel to the brain and spinal cord, where they are processed and lead to immediate actions. Central and Peripheral Nervous System: The central nervous system (CNS), consisting of the brain and spinal cord, interprets sensory information and initiates responses. The peripheral nervous system (PNS) carries signals between the CNS and the rest of the body, including muscles and glands. Autonomic Nervous System: A subdivision of the PNS, the autonomic nervous system (ANS) controls involuntary functions like heart rate, digestion, and respiratory rate. It has two branches: Sympathetic Nervous System: Activates the \"fight or flight\" response during stress. Parasympathetic Nervous System: Promotes \"rest and digest\" activities, conserving energy. Endocrine System and Its Role in Homeostasis: Hormonal Regulation: The endocrine system regulates body functions through hormones, chemical messengers released by glands such as the pituitary, thyroid, and adrenal glands. Hormones travel through the bloodstream to target organs, where they elicit specific responses to maintain balance. Slower, Sustained Responses: Compared to the nervous system, the endocrine system acts more slowly but has longer-lasting effects. This is crucial for processes that require sustained regulation, such as growth, metabolism, and reproduction. Coordination Between Nervous and Endocrine Systems: Hypothalamus-Pituitary Axis: The hypothalamus, a part of the brain, serves as a critical link between the nervous and endocrine systems. It receives signals from the nervous system and responds by releasing hormones that control the pituitary gland, often referred to as the \"master gland.\" The pituitary gland, in turn, releases hormones that regulate other endocrine glands, coordinating the body\'s response to various stimuli. Feedback Mechanisms: Both systems rely on feedback loops to maintain homeostasis. For example, if blood sugar levels are too high, the pancreas (an endocrine gland) releases insulin to lower it. The nervous system monitors these levels and can trigger further hormonal adjustments as needed. Stress Response: During stress, the nervous system triggers the adrenal glands to release adrenaline and cortisol. Adrenaline provides an immediate \"fight or flight\" response, while cortisol ensures the body remains prepared for extended stress, illustrating how both systems work in tandem. Temperature Regulation: The nervous system detects changes in body temperature and signals the hypothalamus, which can initiate responses such as sweating (through the nervous system) or adjusting metabolism (through the endocrine system) to restore normal temperature. Conclusion: The nervous and endocrine systems are interdependent, with the nervous system providing rapid, short-term control and the endocrine system offering slower, long-term regulation. Together, they ensure that the body\'s internal environment remains stable, allowing it to function optimally even when external conditions change.

2.

What is the mechanism of nerve impulse transmission? This question focuses on understanding how electrical signals are transmitted along neurons, including the roles of sodium-potassium pumps, action potentials, and synapses.

Answer: Nerve impulse transmission, or the propagation of electrical signals along neurons, is a fundamental process in the nervous system. It involves several key steps and mechanisms, including the generation of an action potential, the role of sodium-potassium pumps, and the transmission of signals across synapses. Key Components of Nerve Impulse Transmission: Neuron Structure: Dendrites: Receive signals from other neurons or sensory receptors. Cell Body (Soma): Contains the nucleus and integrates incoming signals. Axon: Conducts electrical impulses away from the cell body. Axon Terminals: Release neurotransmitters to communicate with other neurons or effectors. Resting Membrane Potential: Neurons maintain a resting membrane potential of approximately -70 mV, where the inside of the neuron is negatively charged relative to the outside. This potential is established by the uneven distribution of ions, particularly sodium (Na⁺) and potassium (K⁺) ions, across the cell membrane, maintained by sodium-potassium pumps. Steps in Nerve Impulse Transmission: Resting State: In the resting state, the neuron is polarized, with the inside of the cell being more negative than the outside. The sodium-potassium pump actively transports 3 Na⁺ ions out of the cell and 2 K⁺ ions into the cell, maintaining the resting membrane potential. Depolarization: When a stimulus is strong enough, it triggers the opening of voltage-gated sodium channels. Na⁺ ions rush into the neuron, causing the membrane potential to become less negative (depolarization). If the depolarization reaches a certain threshold (around -55 mV), an action potential is generated, and the membrane potential rapidly rises to about +30 mV. Propagation of the Action Potential: The influx of Na⁺ ions at one point on the axon causes a local reversal of the membrane potential, which triggers adjacent voltage-gated sodium channels to open. This creates a wave of depolarization that travels down the axon, carrying the nerve impulse. The action potential propagates along the axon in a unidirectional manner, as the areas that have just undergone depolarization enter a refractory period, preventing the impulse from traveling backward. Repolarization: Shortly after the peak of the action potential, voltage-gated sodium channels close and voltage-gated potassium channels open, allowing K⁺ ions to flow out of the neuron. This efflux of K⁺ restores the negative membrane potential, a process known as repolarization. Hyperpolarization and Return to Resting State: The membrane potential temporarily becomes more negative than the resting potential due to the continued outflow of K⁺ (hyperpolarization). The sodium-potassium pump gradually restores the resting membrane potential by moving Na⁺ out of the cell and K⁺ back in. Synaptic Transmission: Arrival at the Axon Terminal: When the action potential reaches the axon terminal, it triggers the opening of voltage-gated calcium (Ca²⁺) channels, allowing Ca²⁺ ions to enter the terminal. Release of Neurotransmitters: The influx of Ca²⁺ ions causes synaptic vesicles filled with neurotransmitters to fuse with the presynaptic membrane, releasing their contents into the synaptic cleft (the gap between neurons). Binding to Receptors: Neurotransmitters diffuse across the synaptic cleft and bind to specific receptors on the postsynaptic membrane, leading to the opening of ion channels in the postsynaptic neuron. Depending on the type of neurotransmitter and receptor, this can either depolarize (excitatory) or hyperpolarize (inhibitory) the postsynaptic neuron. Generation of a New Action Potential: If the postsynaptic neuron is sufficiently depolarized and reaches the threshold potential, a new action potential is generated, and the impulse is transmitted onward. Termination of the Signal: Neurotransmitters are either broken down by enzymes, reabsorbed by the presynaptic neuron, or diffuse away from the synaptic cleft, terminating the signal. Conclusion: The transmission of nerve impulses is a complex process involving the generation and propagation of action potentials along neurons, followed by synaptic transmission to other neurons or effectors. The coordinated actions of ion channels, sodium-potassium pumps, and neurotransmitters ensure the precise communication necessary for the nervous system to function effectively.

3.

How do hormones regulate various physiological processes? Hormones play a critical role in control and coordination. This question examines how different hormones affect processes like growth, metabolism, and reproduction.

Answer: Nerve impulse transmission, or the propagation of electrical signals along neurons, is a fundamental process in the nervous system. It involves several key steps and mechanisms, including the generation of an action potential, the role of sodium-potassium pumps, and the transmission of signals across synapses. Key Components of Nerve Impulse Transmission: Neuron Structure: Dendrites: Receive signals from other neurons or sensory receptors. Cell Body (Soma): Contains the nucleus and integrates incoming signals. Axon: Conducts electrical impulses away from the cell body. Axon Terminals: Release neurotransmitters to communicate with other neurons or effectors. Resting Membrane Potential: Neurons maintain a resting membrane potential of approximately -70 mV, where the inside of the neuron is negatively charged relative to the outside. This potential is established by the uneven distribution of ions, particularly sodium (Na⁺) and potassium (K⁺) ions, across the cell membrane, maintained by sodium-potassium pumps. Steps in Nerve Impulse Transmission: Resting State: In the resting state, the neuron is polarized, with the inside of the cell being more negative than the outside. The sodium-potassium pump actively transports 3 Na⁺ ions out of the cell and 2 K⁺ ions into the cell, maintaining the resting membrane potential. Depolarization: When a stimulus is strong enough, it triggers the opening of voltage-gated sodium channels. Na⁺ ions rush into the neuron, causing the membrane potential to become less negative (depolarization). If the depolarization reaches a certain threshold (around -55 mV), an action potential is generated, and the membrane potential rapidly rises to about +30 mV. Propagation of the Action Potential: The influx of Na⁺ ions at one point on the axon causes a local reversal of the membrane potential, which triggers adjacent voltage-gated sodium channels to open. This creates a wave of depolarization that travels down the axon, carrying the nerve impulse. The action potential propagates along the axon in a unidirectional manner, as the areas that have just undergone depolarization enter a refractory period, preventing the impulse from traveling backward. Repolarization: Shortly after the peak of the action potential, voltage-gated sodium channels close and voltage-gated potassium channels open, allowing K⁺ ions to flow out of the neuron. This efflux of K⁺ restores the negative membrane potential, a process known as repolarization. Hyperpolarization and Return to Resting State: The membrane potential temporarily becomes more negative than the resting potential due to the continued outflow of K⁺ (hyperpolarization). The sodium-potassium pump gradually restores the resting membrane potential by moving Na⁺ out of the cell and K⁺ back in. Synaptic Transmission: Arrival at the Axon Terminal: When the action potential reaches the axon terminal, it triggers the opening of voltage-gated calcium (Ca²⁺) channels, allowing Ca²⁺ ions to enter the terminal. Release of Neurotransmitters: The influx of Ca²⁺ ions causes synaptic vesicles filled with neurotransmitters to fuse with the presynaptic membrane, releasing their contents into the synaptic cleft (the gap between neurons). Binding to Receptors: Neurotransmitters diffuse across the synaptic cleft and bind to specific receptors on the postsynaptic membrane, leading to the opening of ion channels in the postsynaptic neuron. Depending on the type of neurotransmitter and receptor, this can either depolarize (excitatory) or hyperpolarize (inhibitory) the postsynaptic neuron. Generation of a New Action Potential: If the postsynaptic neuron is sufficiently depolarized and reaches the threshold potential, a new action potential is generated, and the impulse is transmitted onward. Termination of the Signal: Neurotransmitters are either broken down by enzymes, reabsorbed by the presynaptic neuron, or diffuse away from the synaptic cleft, terminating the signal. Conclusion: The transmission of nerve impulses is a complex process involving the generation and propagation of action potentials along neurons, followed by synaptic transmission to other neurons or effectors. The coordinated actions of ion channels, sodium-potassium pumps, and neurotransmitters ensure the precise communication necessary for the nervous system to function effectively. You said: How do hormones regulate various physiological processes? Hormones play a critical role in control and coordination. This question examines how different hormones affect processes like growth, metabolism, and reproduction. ChatGPT said: ChatGPT Hormones are chemical messengers produced by endocrine glands that regulate a wide range of physiological processes in the body. These hormones are released into the bloodstream, where they travel to target organs or tissues, binding to specific receptors and triggering various biological responses. Here’s how hormones regulate key physiological processes: 1. Growth and Development: Growth Hormone (GH): Produced by the pituitary gland, GH stimulates growth in tissues, especially bones and muscles. It promotes cell division, protein synthesis, and increases the length of long bones during childhood and adolescence. Thyroid Hormones (T3 and T4): Produced by the thyroid gland, these hormones are essential for normal growth and development. They regulate metabolism and are crucial for the development of the brain and nervous system in children. Sex Hormones (Estrogen and Testosterone): Estrogen (in females) and testosterone (in males) are responsible for the development of secondary sexual characteristics during puberty. They also play roles in reproductive organ development and the regulation of reproductive cycles. 2. Metabolism: Insulin: Secreted by the pancreas, insulin regulates blood glucose levels by facilitating the uptake of glucose into cells, particularly in the liver, muscle, and fat tissue. It promotes the storage of glucose as glycogen and inhibits the breakdown of fat. Glucagon: Also produced by the pancreas, glucagon works in opposition to insulin. It stimulates the breakdown of glycogen to glucose in the liver, increasing blood glucose levels during fasting or between meals. Thyroid Hormones (T3 and T4): These hormones increase the basal metabolic rate (BMR) by stimulating energy production in cells. They enhance oxygen consumption and heat production, thereby influencing overall metabolism. Cortisol: Produced by the adrenal glands, cortisol is involved in glucose metabolism and the body’s response to stress. It increases blood sugar levels by promoting gluconeogenesis in the liver and mobilizes fat stores for energy. 3. Reproduction: Estrogen and Progesterone: These hormones are primarily produced by the ovaries in females. Estrogen regulates the menstrual cycle, promotes the growth of the uterine lining, and is involved in the development of female secondary sexual characteristics. Progesterone prepares the uterus for pregnancy and supports early pregnancy by maintaining the uterine lining. Testosterone: In males, testosterone is produced by the testes and is essential for the development of male reproductive organs, sperm production, and secondary sexual characteristics such as facial hair and a deeper voice. Luteinizing Hormone (LH) and Follicle-Stimulating Hormone (FSH): These hormones, produced by the pituitary gland, regulate the reproductive processes in both males and females. In females, LH and FSH control the menstrual cycle and ovulation. In males, they regulate sperm production and testosterone secretion. 4. Stress Response: Adrenaline (Epinephrine): Produced by the adrenal medulla, adrenaline is a key hormone in the \"fight or flight\" response. It increases heart rate, blood pressure, and blood glucose levels, preparing the body to respond to immediate stress. Cortisol: In addition to its role in metabolism, cortisol helps the body cope with long-term stress. It modulates the immune response, reduces inflammation, and helps maintain blood glucose levels during prolonged stress. 5. Water and Electrolyte Balance: Antidiuretic Hormone (ADH): Produced by the hypothalamus and released by the pituitary gland, ADH regulates water balance in the body. It increases water reabsorption in the kidneys, reducing urine output and helping to maintain blood pressure and hydration. Aldosterone: Secreted by the adrenal cortex, aldosterone regulates sodium and potassium levels in the blood. It promotes sodium reabsorption and potassium excretion by the kidneys, which helps control blood pressure and blood volume. 6. Appetite and Digestion: Ghrelin: Produced by the stomach, ghrelin stimulates appetite by signaling hunger to the brain. Its levels increase before meals and decrease after eating. Leptin: Secreted by fat cells, leptin signals satiety and helps regulate energy balance by inhibiting hunger. It plays a crucial role in long-term energy regulation and body weight. Cholecystokinin (CCK): Released by the small intestine, CCK promotes digestion by stimulating the release of digestive enzymes from the pancreas and bile from the gallbladder. It also signals fullness to the brain. 7. Immune Function: Cortisol: While cortisol has anti-inflammatory effects, it can also suppress the immune system when present in high levels over long periods. This helps prevent an overactive immune response but can also increase susceptibility to infections if levels remain elevated. Thymosin: Produced by the thymus gland, thymosin plays a role in the development and differentiation of T-cells, which are critical for the adaptive immune response. Conclusion: Hormones are vital regulators of numerous physiological processes, ensuring that the body can grow, reproduce, metabolize nutrients, respond to stress, and maintain homeostasis. The precise coordination of hormone secretion and action allows the body to function efficiently and adapt to changing internal and external conditions.

4.

What is the role of feedback mechanisms in control and coordination? Feedback mechanisms, such as negative and positive feedback loops, are vital in maintaining balance within biological systems. This question investigates how these loops function in different physiological processes.

Answer: Feedback mechanisms are essential regulatory processes that help maintain homeostasis and ensure the proper functioning of biological systems. These mechanisms are broadly classified into two types: negative feedback and positive feedback. Both play crucial roles in control and coordination by modulating physiological activities in response to changes in the internal or external environment. 1. Negative Feedback Mechanisms Definition: Negative feedback is a regulatory mechanism in which a change in a physiological variable triggers a response that counteracts or reduces the initial change, thereby bringing the system back to its set point or normal range. Role in Control and Coordination: Negative feedback loops are the most common type of feedback mechanism in the body. They help maintain homeostasis by correcting deviations from a set point. Examples: Body Temperature Regulation: Stimulus: A rise in body temperature above the normal range. Response: The hypothalamus detects the increase and triggers mechanisms such as sweating and vasodilation (widening of blood vessels). Sweating cools the body through evaporation, and vasodilation increases blood flow to the skin, allowing more heat to dissipate. Result: Body temperature decreases, returning to the normal range, and the hypothalamus reduces its corrective signals. Blood Glucose Regulation: Stimulus: An increase in blood glucose levels after eating. Response: The pancreas secretes insulin, which promotes the uptake of glucose by cells and stimulates the liver to convert glucose into glycogen for storage. Result: Blood glucose levels decrease, and insulin secretion is reduced once levels return to normal. Blood Pressure Regulation: Stimulus: A drop in blood pressure. Response: The baroreceptors (pressure-sensitive cells) in the arteries detect the decrease and signal the brain. The brain responds by increasing heart rate and constricting blood vessels (vasoconstriction). Result: Blood pressure rises back to the normal range, and the feedback loop reduces the corrective actions. 2. Positive Feedback Mechanisms Definition: Positive feedback is a regulatory mechanism in which a change in a physiological variable triggers a response that amplifies or increases the initial change, moving the system further away from its starting condition. Role in Control and Coordination: Positive feedback loops are less common but are crucial in processes that require a rapid or self-perpetuating response. Unlike negative feedback, they do not maintain homeostasis but instead drive processes to completion. Examples: Childbirth (Labor): Stimulus: The onset of labor contractions. Response: The contractions push the baby towards the cervix, stretching it. This stretch is detected by sensors that signal the release of oxytocin from the pituitary gland. Result: Oxytocin increases the strength and frequency of contractions, further stretching the cervix and increasing oxytocin release. This loop continues until the baby is born. Blood Clotting: Stimulus: Injury to a blood vessel. Response: Platelets adhere to the site of injury and release chemicals that attract more platelets to form a clot. Result: The accumulation of platelets and the release of clotting factors lead to the rapid formation of a blood clot, which stops bleeding. Once the clot forms, the feedback loop is halted by the removal of the stimulus (cessation of bleeding). 3. Interaction Between Negative and Positive Feedback In some physiological processes, both types of feedback mechanisms work together to achieve a balanced outcome. For example: Lactation: Positive Feedback: When a baby suckles, nerve signals are sent to the brain, leading to the release of oxytocin, which stimulates milk ejection (let-down reflex). The more the baby suckles, the more milk is released. Negative Feedback: Once feeding is complete, the stimulus (suckling) is removed, and milk production slows down, preventing overproduction. Conclusion: Feedback mechanisms are vital for control and coordination in biological systems. Negative feedback loops are crucial for maintaining homeostasis by counteracting changes and keeping physiological variables within a narrow range. Positive feedback loops, although less common, play essential roles in processes that require a rapid and decisive response. Together, these mechanisms ensure that the body can adapt to changes and function efficiently.

5.

How do different parts of the brain contribute to control and coordination? The brain is a central organ in the nervous system, with different regions controlling various functions. This question delves into the roles of the cerebrum, cerebellum, brainstem, and other parts of the brain.

Answer: The brain is a highly complex organ that serves as the control center for the body\'s nervous system. It coordinates a wide range of functions, from basic survival mechanisms to advanced cognitive processes. Different parts of the brain contribute to control and coordination in specific ways, each playing distinct roles in regulating bodily functions and behavior. Here’s an overview of the key brain regions and their contributions: 1. Cerebrum Structure and Function: The cerebrum is the largest part of the brain, divided into two hemispheres (left and right), and each hemisphere is further divided into four lobes: frontal, parietal, temporal, and occipital. Role in Control and Coordination: Frontal Lobe: Motor Control: The primary motor cortex, located in the frontal lobe, is responsible for voluntary movement. It controls the execution of motor activities by sending signals to muscles. Cognitive Functions: The frontal lobe is involved in higher cognitive functions such as decision-making, problem-solving, planning, and reasoning. Personality and Behavior: This region also plays a key role in regulating emotions, behavior, and personality traits. Parietal Lobe: Sensory Integration: The primary somatosensory cortex, located in the parietal lobe, processes sensory information such as touch, temperature, and pain from different parts of the body. Spatial Awareness: The parietal lobe is involved in spatial orientation and the perception of the body in space, which is crucial for coordination and movement. Temporal Lobe: Hearing and Language: The temporal lobe contains the primary auditory cortex, responsible for processing auditory information. It also plays a critical role in language comprehension, particularly in areas like Wernicke’s area. Memory: The temporal lobe is associated with memory formation and retrieval, particularly through the hippocampus, which is crucial for forming long-term memories. Occipital Lobe: Vision: The primary visual cortex, located in the occipital lobe, is responsible for processing visual information. It interprets signals from the eyes to create images, allowing us to understand and interact with our visual environment. 2. Cerebellum Structure and Function: The cerebellum is located at the back of the brain, beneath the occipital lobe. It has a highly folded surface, which increases its processing capacity. Role in Control and Coordination: Motor Coordination: The cerebellum is crucial for coordinating voluntary movements. It fine-tunes motor activities by adjusting the force, timing, and precision of muscle actions, ensuring smooth and balanced movements. Balance and Posture: It helps maintain balance and posture by processing information from the inner ear and sensory systems, adjusting body movements to keep us upright. Motor Learning: The cerebellum is involved in motor learning, allowing us to acquire new skills and refine movements through practice, such as riding a bicycle or playing an instrument. 3. Brainstem Structure and Function: The brainstem is located at the base of the brain and connects the cerebrum with the spinal cord. It consists of three main parts: the midbrain, pons, and medulla oblongata. Role in Control and Coordination: Autonomic Functions: The brainstem controls vital involuntary functions, such as heart rate, breathing, blood pressure, and digestion. These processes are essential for survival and are regulated by the medulla oblongata. Reflexes: The brainstem manages basic reflexes, including swallowing, coughing, and vomiting, which protect the body from harm. Sleep-Wake Cycle: The brainstem, particularly the reticular formation, plays a role in regulating the sleep-wake cycle and consciousness. Relay Center: It acts as a relay station for information traveling between the brain and the rest of the body, ensuring communication and coordination across different regions. 4. Limbic System Structure and Function: The limbic system is a group of interconnected structures located deep within the brain, including the hippocampus, amygdala, hypothalamus, and thalamus. Role in Control and Coordination: Emotions: The amygdala is key in processing emotions, especially fear, pleasure, and anger. It helps coordinate the body\'s response to emotional stimuli. Memory: The hippocampus is essential for forming and retrieving long-term memories, particularly those associated with emotions and experiences. Motivation and Reward: The limbic system, particularly the nucleus accumbens, is involved in motivation and reward processing, influencing behavior and decision-making based on past experiences and emotional states. Homeostasis: The hypothalamus, part of the limbic system, regulates homeostatic functions such as hunger, thirst, temperature control, and the release of hormones from the pituitary gland. 5. Thalamus Structure and Function: The thalamus is located near the center of the brain, just above the brainstem. It acts as a relay station for sensory and motor signals. Role in Control and Coordination: Sensory Processing: The thalamus receives sensory information (except for smell) and relays it to the appropriate areas of the cerebral cortex for processing. Motor Control: It also plays a role in motor control by transmitting motor signals from the cerebellum and basal ganglia to the motor cortex. Regulation of Consciousness and Alertness: The thalamus is involved in regulating consciousness, alertness, and the sleep-wake cycle, contributing to overall awareness and responsiveness. 6. Basal Ganglia Structure and Function: The basal ganglia are a group of nuclei located deep within the cerebral hemispheres, including the caudate nucleus, putamen, and globus pallidus. Role in Control and Coordination: Movement Regulation: The basal ganglia are involved in the initiation and regulation of voluntary movements. They help modulate movement intensity, inhibit unwanted movements, and ensure smooth, coordinated motor activities. Habit Formation: The basal ganglia play a role in habit formation, influencing routine behaviors and learned motor patterns. Conclusion: Different parts of the brain contribute to control and coordination by managing specific functions, from basic survival processes to complex cognitive activities. The cerebrum handles higher-order thinking, sensory processing, and voluntary movement; the cerebellum ensures smooth and coordinated motor actions; the brainstem manages vital autonomic functions; and the limbic system regulates emotions, memory, and motivation. Together, these regions work in harmony to maintain balance and enable the body to respond effectively to internal and external stimuli.

Class 10th One -Sho

CONTROL
COORDINA
BIOLOG

,TOPICS COV

,CONTROL AND CO

, CONTROL AND CO

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