Hormone release stops when the stimulus that triggered it - like thirst or high blood sugar is satisfied or corrected. This is called:

Correct Answer: B

Rationale: Negative feedback systems halt hormone release when the initiating stimulus is resolved, maintaining homeostasis, e.g., insulin secretion stops when blood sugar normalizes.

Correct Answer: C

Rationale: Tropic hormones (e.g., TSH, ACTH) regulate other endocrine glands' secretions.

Correct Answer: B

Rationale: Catecholamines (e.g., epinephrine) use second messengers like cAMP.

Correct Answer: D

Rationale: Only hydrophilic hormones use second messengers; both types use plasma proteins.

Correct Answer: B

Rationale: The posterior pituitary connects to the hypothalamus via the infundibulum.