The 'zona' regions of a particular endocrine gland do not secrete

Correct Answer: B

Rationale: The adrenal cortex (zonae) does not secrete epinephrine; that's from the medulla.

Correct Answer: C

Rationale: Assuming 'TSN' is a typo for TSH (thyroid-stimulating hormone), cold temperatures stimulate its release via TRH. Dopamine and somatostatin inhibit it, stress has variable effects, and glucocorticoids suppress it.

Correct Answer: D

Rationale: Fat stores vastly exceed carbohydrate (glycogen) stores, approximately 40:1 in a typical human, reflecting fat's higher energy density.

Correct Answer: C

Rationale: Ketone bodies form during glucose deficiency (e.g., fasting), are acids, but are metabolized by extrahepatic tissues, not easily in the liver.

Correct Answer: B

Rationale: VIP (vasoactive intestinal peptide) relaxes smooth muscle and increases intestinal water/electrolyte secretion.