Which of the following is a neurohormone?

Correct Answer: A

Rationale: Vasopressin is a hypothalamic neurohormone released by the posterior pituitary.

Correct Answer: D

Rationale: Vasopressin regulates water balance, not reproduction.

Correct Answer: A

Rationale: GH primarily acts via IGFs to promote growth.

Correct Answer: A

Rationale: Albumin has the largest capacity to bind thyroxine due to its high plasma concentration, though TBG has higher affinity. Transferrin and ferritin are involved in iron transport/storage, not thyroxine.

Correct Answer: D

Rationale: Exercise stimulates glucagon secretion to mobilize glucose. Somatostatin, glucose, and insulin inhibit it, while ketones have a lesser direct effect.