WGU D446 ENDOCRINE SYSTEM COMPLETE SET OF VERIFIED
EXAM QUESTIONS AND ACCURATE ANSWERS WITH A
GUARANTEED PASS PROMISE
1. What is the endocrine system? A system of glands that secrete hormones
directly into the bloodstream to regulate body functions, including metabolism,
growth, reproduction, and homeostasis.
2. What are hormones? Chemical messengers produced by endocrine glands
that travel through the bloodstream to target cells and organs to regulate
physiological processes.
3. What is the difference between endocrine and exocrine glands?
Endocrine glands secrete hormones directly into the bloodstream without ducts,
while exocrine glands secrete substances through ducts to external surfaces or
cavities (like sweat or digestive enzymes).
4. What are the major endocrine glands? Hypothalamus, pituitary, pineal,
thyroid, parathyroid, thymus, adrenal glands, pancreas, and gonads (ovaries and
testes).
5. What is a target cell? A cell that has specific receptors for a particular
hormone and responds to that hormone's signal.
6. How do hormones travel through the body? Most hormones travel
dissolved in blood plasma, while some lipid-soluble hormones are bound to
transport proteins.
7. What are the three main chemical classes of hormones? Peptide/protein
hormones, steroid hormones, and amino acid-derived hormones.
8. What is negative feedback in the endocrine system? A regulatory
mechanism where the output of a system inhibits or reduces the original
stimulus, maintaining homeostasis.
9. What is positive feedback in the endocrine system? A mechanism where
the output enhances or amplifies the original stimulus, used less commonly than
negative feedback (e.g., oxytocin during childbirth).
10. What is the half-life of a hormone? The time required for half of the
hormone molecules to be removed from the bloodstream through metabolism or
excretion.
,11. What are hormone receptors? Protein molecules on or in target cells that
bind specifically to particular hormones, initiating cellular responses.
12. Where are receptors for water-soluble hormones located? On the cell
membrane surface, since these hormones cannot pass through the lipid bilayer.
13. Where are receptors for lipid-soluble hormones located? Inside the cell
(cytoplasm or nucleus), since these hormones can pass through the cell
membrane.
14. What is upregulation? An increase in the number of hormone receptors,
making cells more sensitive to a hormone.
15. What is downregulation? A decrease in the number of hormone receptors,
making cells less sensitive to a hormone, often occurring with prolonged
exposure to high hormone levels.
16. What is a tropic hormone? A hormone that stimulates another endocrine
gland to secrete its hormones.
17. What is the hypothalamic-pituitary axis? The complex interaction
between the hypothalamus and pituitary gland that regulates numerous
endocrine functions throughout the body.
18. What is paracrine signaling? Local hormone action where hormones
affect nearby cells without entering the bloodstream.
19. What is autocrine signaling? When a hormone affects the same cell that
secreted it.
20. What determines hormone specificity? The presence of specific receptors
on target cells that match the molecular structure of particular hormones.
21. What is humoral stimulation of hormone release? Hormone secretion
triggered by changes in blood levels of ions or nutrients (e.g., glucose levels
affecting insulin).
22. What is neural stimulation of hormone release? Hormone secretion
triggered by nerve impulses (e.g., sympathetic stimulation of adrenal medulla).
23. What is hormonal stimulation of hormone release? Hormone secretion
triggered by other hormones (e.g., TSH stimulating thyroid hormone release).
24. What is synergism in hormone action? When two or more hormones work
together to produce effects greater than the sum of their individual effects.
, 25. What is permissiveness in hormone action? When one hormone must be
present for another hormone to exert its full effect.
26. What is antagonism in hormone action? When one hormone opposes or
reduces the effects of another hormone.
27. How are peptide hormones synthesized? Synthesized as preprohormones
in the rough endoplasmic reticulum, processed to prohormones, then stored in
secretory vesicles until released.
28. How are steroid hormones synthesized? Synthesized from cholesterol in
the smooth endoplasmic reticulum and mitochondria, then released immediately
(not stored).
29. What is the primary mechanism of hormone degradation? Enzymatic
breakdown in the liver and kidneys, followed by excretion.
30. What is receptor saturation? When all available hormone receptors are
occupied, limiting the maximum cellular response regardless of additional
hormone presence.
Hypothalamus (Questions 31-50)
31. Where is the hypothalamus located? In the diencephalon of the brain,
below the thalamus and above the pituitary gland.
32. What is the primary function of the hypothalamus? Serves as the major
link between the nervous and endocrine systems, regulating homeostasis
through hormone secretion and autonomic nervous system control.
33. What are hypothalamic releasing hormones? Hormones secreted by the
hypothalamus that stimulate the anterior pituitary to release its hormones.
34. What are hypothalamic inhibiting hormones? Hormones secreted by the
hypothalamus that suppress the release of anterior pituitary hormones.
35. What is TRH (Thyrotropin-Releasing Hormone)? A hypothalamic
hormone that stimulates the anterior pituitary to release TSH (thyroid-
stimulating hormone).
36. What is CRH (Corticotropin-Releasing Hormone)? A hypothalamic
hormone that stimulates the anterior pituitary to release ACTH
(adrenocorticotropic hormone).
37. What is GnRH (Gonadotropin-Releasing Hormone)? A hypothalamic
hormone that stimulates the anterior pituitary to release FSH and LH.
EXAM QUESTIONS AND ACCURATE ANSWERS WITH A
GUARANTEED PASS PROMISE
1. What is the endocrine system? A system of glands that secrete hormones
directly into the bloodstream to regulate body functions, including metabolism,
growth, reproduction, and homeostasis.
2. What are hormones? Chemical messengers produced by endocrine glands
that travel through the bloodstream to target cells and organs to regulate
physiological processes.
3. What is the difference between endocrine and exocrine glands?
Endocrine glands secrete hormones directly into the bloodstream without ducts,
while exocrine glands secrete substances through ducts to external surfaces or
cavities (like sweat or digestive enzymes).
4. What are the major endocrine glands? Hypothalamus, pituitary, pineal,
thyroid, parathyroid, thymus, adrenal glands, pancreas, and gonads (ovaries and
testes).
5. What is a target cell? A cell that has specific receptors for a particular
hormone and responds to that hormone's signal.
6. How do hormones travel through the body? Most hormones travel
dissolved in blood plasma, while some lipid-soluble hormones are bound to
transport proteins.
7. What are the three main chemical classes of hormones? Peptide/protein
hormones, steroid hormones, and amino acid-derived hormones.
8. What is negative feedback in the endocrine system? A regulatory
mechanism where the output of a system inhibits or reduces the original
stimulus, maintaining homeostasis.
9. What is positive feedback in the endocrine system? A mechanism where
the output enhances or amplifies the original stimulus, used less commonly than
negative feedback (e.g., oxytocin during childbirth).
10. What is the half-life of a hormone? The time required for half of the
hormone molecules to be removed from the bloodstream through metabolism or
excretion.
,11. What are hormone receptors? Protein molecules on or in target cells that
bind specifically to particular hormones, initiating cellular responses.
12. Where are receptors for water-soluble hormones located? On the cell
membrane surface, since these hormones cannot pass through the lipid bilayer.
13. Where are receptors for lipid-soluble hormones located? Inside the cell
(cytoplasm or nucleus), since these hormones can pass through the cell
membrane.
14. What is upregulation? An increase in the number of hormone receptors,
making cells more sensitive to a hormone.
15. What is downregulation? A decrease in the number of hormone receptors,
making cells less sensitive to a hormone, often occurring with prolonged
exposure to high hormone levels.
16. What is a tropic hormone? A hormone that stimulates another endocrine
gland to secrete its hormones.
17. What is the hypothalamic-pituitary axis? The complex interaction
between the hypothalamus and pituitary gland that regulates numerous
endocrine functions throughout the body.
18. What is paracrine signaling? Local hormone action where hormones
affect nearby cells without entering the bloodstream.
19. What is autocrine signaling? When a hormone affects the same cell that
secreted it.
20. What determines hormone specificity? The presence of specific receptors
on target cells that match the molecular structure of particular hormones.
21. What is humoral stimulation of hormone release? Hormone secretion
triggered by changes in blood levels of ions or nutrients (e.g., glucose levels
affecting insulin).
22. What is neural stimulation of hormone release? Hormone secretion
triggered by nerve impulses (e.g., sympathetic stimulation of adrenal medulla).
23. What is hormonal stimulation of hormone release? Hormone secretion
triggered by other hormones (e.g., TSH stimulating thyroid hormone release).
24. What is synergism in hormone action? When two or more hormones work
together to produce effects greater than the sum of their individual effects.
, 25. What is permissiveness in hormone action? When one hormone must be
present for another hormone to exert its full effect.
26. What is antagonism in hormone action? When one hormone opposes or
reduces the effects of another hormone.
27. How are peptide hormones synthesized? Synthesized as preprohormones
in the rough endoplasmic reticulum, processed to prohormones, then stored in
secretory vesicles until released.
28. How are steroid hormones synthesized? Synthesized from cholesterol in
the smooth endoplasmic reticulum and mitochondria, then released immediately
(not stored).
29. What is the primary mechanism of hormone degradation? Enzymatic
breakdown in the liver and kidneys, followed by excretion.
30. What is receptor saturation? When all available hormone receptors are
occupied, limiting the maximum cellular response regardless of additional
hormone presence.
Hypothalamus (Questions 31-50)
31. Where is the hypothalamus located? In the diencephalon of the brain,
below the thalamus and above the pituitary gland.
32. What is the primary function of the hypothalamus? Serves as the major
link between the nervous and endocrine systems, regulating homeostasis
through hormone secretion and autonomic nervous system control.
33. What are hypothalamic releasing hormones? Hormones secreted by the
hypothalamus that stimulate the anterior pituitary to release its hormones.
34. What are hypothalamic inhibiting hormones? Hormones secreted by the
hypothalamus that suppress the release of anterior pituitary hormones.
35. What is TRH (Thyrotropin-Releasing Hormone)? A hypothalamic
hormone that stimulates the anterior pituitary to release TSH (thyroid-
stimulating hormone).
36. What is CRH (Corticotropin-Releasing Hormone)? A hypothalamic
hormone that stimulates the anterior pituitary to release ACTH
(adrenocorticotropic hormone).
37. What is GnRH (Gonadotropin-Releasing Hormone)? A hypothalamic
hormone that stimulates the anterior pituitary to release FSH and LH.
