Hormones produced in the anterior pituitary are

Correct Answer: D

Rationale: All statements describe anterior pituitary hormone production and regulation.

Correct Answer: B

Rationale: T_3 (triiodothyronine) is more potent than T_4 (thyroxine), though T_4 is secreted in larger amounts and converted to T_3 peripherally. The thyroid is not essential for life (adults can survive thyroidectomy with hormone replacement), RT_3 is inactive, and T_3 does not convert to T_4.

Correct Answer: D

Rationale: Somatostatin inhibits insulin secretion from β cells. CCK, amino acids, glucagon, and glucose stimulate it.

Correct Answer: C

Rationale: Aldosterone is secreted by the zona glomerulosa of the adrenal cortex.

Correct Answer: D

Rationale: Prostaglandin E inhibits hormone-sensitive lipase, reducing lipolysis, while adrenaline, thyroxine, and TSH stimulate it; serotonin has minimal direct effect.