IBSS 1540 Exam 1 Questions and Answers with Verified Solutions |
Latest 2026 Update
Q: produced, what occurs int he feedback loop?
Answer:
low levels of cortisol increase production of CRH in the hypothalamus and ACTH in
the pituitary, but they still have no effect on the amount of cortisol produced
Q: In Cushing's disease, when an adenoma in the pituitary causes a high level of
ACTH secretion, what would you expect to occur in the feedback loop?
Answer:
the high amount of ACTH produced causes a lot of cortisol to be synthesized in the
adrenal cortex. This high cortisol feeds back to the hypothalamus, causing decreased
levels of CRH, and to the pituitary. However, the pituitary does not respond and high
levels of ACTH persist
,IBSS 1540 Exam 1 Questions and Answers with Verified Solutions |
Latest 2026 Update
Q: In Cushing's syndrome, when a tumor in the adrenal Cortex causes cortisol
secretion to be high, what would you expect to occur in the feedback loop?
Answer:
the high levels of cortisol feedback to both the hypothalamus and pituitary, causing
secretion of CRH and ACTH to both decrease. HOwvere, this has little effect on the
adrenal cortex and high levels of cortisol persist
Q: What would you expect to occur in the cortisol fedcoback regulation in an
individual taking exogenous glucocorticoids?
Answer:
the exogneous administration of the corticosteroids feedback to both the
hypothalamus and pituitary, decreasing secretion of CRH and ACTH. This causes the
adrenal cortex's secretion of cortisol to decrease
Q: What is the role of the sympathetic nervous system in the secretion of
catecholamines?
Answer:
it promotes secretion of these hormones
,IBSS 1540 Exam 1 Questions and Answers with Verified Solutions |
Latest 2026 Update
Q: Which cells of the adrenal gland synthesize catecholamines?
Answer:
the chromaffin cells
Q: What is the role of thyroid hormone in the adrenal synthesis of catecholamines?
Answer:
they catalyze the rate limiting step, converting the tyrosine precursor into DOPA
Q: What steps of catecholamine synthesis are highly regulated by sympathetic
stimulation via acetylcholine?
Answer:
the conversion of tyrosine to DOPA as well as the conversion of dopamine into
norepinephrine
Q: What is the role of cortisol in the synthesis of catecholamines?
Answer:
cortisol regulates the enzyme PNMT, which converts norepinephrine into epnephrine
, IBSS 1540 Exam 1 Questions and Answers with Verified Solutions |
Latest 2026 Update
Q: What are the intermediates in the order they are synthesized in the formation of
catecholamines?
Answer:
tyrosine, DOPA, dopamine, NE, epi
Q: What is the initial substrate for the biosynthesis of catecholamines?
Answer:
tyrosine
Q: What are the two catecholamines?
Answer:
epinephrine and norepinephrine
Q: What happens to DOPA during the synthesis of catecholamines?
Answer:
it is transported from the cytoplasm into a granule of a chromaffin cell in order for
dopamine hydroxylase enzyme to convert it into norepinephrine
Latest 2026 Update
Q: produced, what occurs int he feedback loop?
Answer:
low levels of cortisol increase production of CRH in the hypothalamus and ACTH in
the pituitary, but they still have no effect on the amount of cortisol produced
Q: In Cushing's disease, when an adenoma in the pituitary causes a high level of
ACTH secretion, what would you expect to occur in the feedback loop?
Answer:
the high amount of ACTH produced causes a lot of cortisol to be synthesized in the
adrenal cortex. This high cortisol feeds back to the hypothalamus, causing decreased
levels of CRH, and to the pituitary. However, the pituitary does not respond and high
levels of ACTH persist
,IBSS 1540 Exam 1 Questions and Answers with Verified Solutions |
Latest 2026 Update
Q: In Cushing's syndrome, when a tumor in the adrenal Cortex causes cortisol
secretion to be high, what would you expect to occur in the feedback loop?
Answer:
the high levels of cortisol feedback to both the hypothalamus and pituitary, causing
secretion of CRH and ACTH to both decrease. HOwvere, this has little effect on the
adrenal cortex and high levels of cortisol persist
Q: What would you expect to occur in the cortisol fedcoback regulation in an
individual taking exogenous glucocorticoids?
Answer:
the exogneous administration of the corticosteroids feedback to both the
hypothalamus and pituitary, decreasing secretion of CRH and ACTH. This causes the
adrenal cortex's secretion of cortisol to decrease
Q: What is the role of the sympathetic nervous system in the secretion of
catecholamines?
Answer:
it promotes secretion of these hormones
,IBSS 1540 Exam 1 Questions and Answers with Verified Solutions |
Latest 2026 Update
Q: Which cells of the adrenal gland synthesize catecholamines?
Answer:
the chromaffin cells
Q: What is the role of thyroid hormone in the adrenal synthesis of catecholamines?
Answer:
they catalyze the rate limiting step, converting the tyrosine precursor into DOPA
Q: What steps of catecholamine synthesis are highly regulated by sympathetic
stimulation via acetylcholine?
Answer:
the conversion of tyrosine to DOPA as well as the conversion of dopamine into
norepinephrine
Q: What is the role of cortisol in the synthesis of catecholamines?
Answer:
cortisol regulates the enzyme PNMT, which converts norepinephrine into epnephrine
, IBSS 1540 Exam 1 Questions and Answers with Verified Solutions |
Latest 2026 Update
Q: What are the intermediates in the order they are synthesized in the formation of
catecholamines?
Answer:
tyrosine, DOPA, dopamine, NE, epi
Q: What is the initial substrate for the biosynthesis of catecholamines?
Answer:
tyrosine
Q: What are the two catecholamines?
Answer:
epinephrine and norepinephrine
Q: What happens to DOPA during the synthesis of catecholamines?
Answer:
it is transported from the cytoplasm into a granule of a chromaffin cell in order for
dopamine hydroxylase enzyme to convert it into norepinephrine
