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Summary Human Anatomy & Physiology - Sensory Systems
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Sensory systems are how we perceive the world around us. Our eyes detect light and send signals to the brain to form images, while our ears pick up sound to help us hear. The skin senses touch, temperature, and pain, sending that information to the brain. Our nose detects smells, and our tongue sen...

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  • February 16, 2025
  • 3
  • 2024/2025
  • Summary

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Sensory Systems



The sensory systems are responsible for detecting environmental stimuli
and converting them into neural signals, which are then processed in the
central nervous system (CNS) to generate perception and appropriate
behavioral responses. Sensory systems play a crucial role in survival,
allowing organisms to interact effectively with their environment. There
are several specialized sensory modalities, including somatosensation,
vision, audition, olfaction, and gustation.



Somatosensation includes touch, pressure, pain, temperature, and
proprioception, which provide feedback about body position and
movement. Vision is based on light detection through photoreceptors in
the retina, allowing for color perception, depth perception, and motion
tracking. Audition involves the detection of sound waves via
mechanoreceptors in the cochlea, enabling speech recognition,
environmental awareness, and balance. Olfaction detects airborne
chemical molecules and is crucial for identifying food, detecting hazards,
and eliciting emotional responses. Gustation, or taste, is the perception of
dissolved chemical compounds via taste buds, aiding in food selection and
digestion preparation.



Sensory processing involves several key concepts. Transduction is the
conversion of physical stimuli into electrical signals by sensory receptors,
serving as the first step in sensory processing. Receptor potential refers to
a graded change in membrane potential due to stimulus detection,
influencing the likelihood of action potential generation. Neural coding
involves the encoding of stimulus type, intensity, and location through
frequency coding and population coding. Adaptation is the decreased
response of sensory receptors to sustained stimuli, such as olfactory
adaptation to odors over time or reduced sensitivity to constant touch.
Sensory information can be encoded via labeled line coding, where each
sensory neuron responds to a specific stimulus and follows a distinct
pathway to the brain, or population coding, where multiple neurons work
together to encode sensory information, increasing resolution and
accuracy.

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