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### Overview of the Endocrine System
1. How does the speed of control in the endocrine system compare to the nervous system? - Answer: The endocrine system operates much slower and more prolonged than the nervous system,
which is another key player i...
1. How does the speed of control in the endocrine system compare to the nervous system?
- Answer: The endocrine system operates much slower and more prolonged than the nervous system,
which is another key player in maintaining homeostasis.
2. What are the chemical messengers used by the endocrine system called?
- Answer: These chemical messengers are known as hormones, as opposed to nerve impulses used by
the nervous system.
3. How do hormones travel throughout the body?
- Answer: Hormones enter the bloodstream and are distributed across the body through the
cardiovascular system.
### Hormonal Responses and Mechanisms
4. What must cells possess in order to respond to hormones?
- Answer: Cells must have the appropriate receptors on their cell membranes to be activated by these
chemical messengers.
5. What term is used to describe cells that respond to hormones from endocrine glands?
- Answer: These responsive cells are referred to as target cells for various endocrine glands.
6. How do hormones maintain homeostasis in body cells?
- Answer: Hormones work by altering the activity of body cells rather than simply stimulating new or
unusual activity.
### Characteristics of Hormones
, 7. What types of molecules are most hormones classified as?
- Answer: The majority of hormones are either steroid or amino acid-based molecules.
### Stimuli for Hormone Release
8. What are the three types of stimuli that trigger hormone secretion from endocrine glands?
- Answer: Hormone release can be prompted by:
- A neural stimulus (nerve fibers)
- A hormonal stimulus (other hormones)
- A humoral stimulus (changes in substance levels in the blood)
9. How is the secretion of most hormones regulated?
- Answer: Most hormones are regulated by a negative feedback system, where increased hormone
levels effectively "turn off" the stimulus for their secretion.
### Master Gland and Its Control
10. Which gland is referred to as the master endocrine gland and why?
- Answer: The anterior pituitary is termed the master gland due to its role in regulating numerous
other endocrine organs.
11. What regulates the anterior pituitary gland, and where do these regulators come from?
- Answer: The anterior pituitary is controlled by releasing hormones secreted by the hypothalamus.
12. What type of organ is the hypothalamus considered to be?
- Answer: The hypothalamus is classified as a neuroendocrine organ since it is part of the brain and
plays a role in both neural and hormonal processes.
### Mechanism of Hormone Action
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