The releases corticotropin in response to from the

Correct Answer: D

Rationale: The anterior pituitary releases ACTH (corticotropin) in response to hypothalamic CRH.

Correct Answer: C

Rationale: Thyroid hormone acts via intracellular nuclear receptors, not G-protein receptors.

Correct Answer: D

Rationale: Somatostatin is secreted by D (delta) cells in the pancreatic islets to regulate insulin and glucagon secretion.

Correct Answer: C

Rationale: Insulin and somatostatin both inhibit glucagon release from A cells. Insulin has disulfide bonds, somatostatin does not; only insulin causes K^+ uptake.

Correct Answer: D

Rationale: Cholesterol inhibits HMG-CoA reductase, is esterified by ACAT, and downregulates LDL receptors via SREBP, making all statements true.