試題詳解

39. The hypothalamus in the brain releases the hormone corticotropin-releasing hormone (CRH) that triggers the release of adrenocorticotropic hormone (ACTH) from the pituitary gland. ACTH travels through the blood to cause the release of cortisol from the cortex of the adrenal glands. If cortisol acts with negative feedback on CRH and ACTH, what would you expect to happen when cortisol is released?
(A) CRH and ACTH levels will decrease
(B) CRH levels will increase, but ACTH levels will decrease
(C) CRH levels will decrease, but ACTH levels will increase
(D) CRH and ACTH levels will increase