Which of the following hormones secreted by the anterior pituitary is non-tropic?

Correct Answer: B

Rationale: Prolactin (PRL) directly affects mammary glands, not other endocrine glands.

Correct Answer: D

Rationale: All listed hormones support growth (e.g., insulin aids metabolism, thyroid hormone aids development).

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.