regarding thyroid hormone, which is false

Correct Answer: A

Rationale: Thyroid hormones (T3/T4) lower plasma cholesterol by enhancing LDL receptor clearance, not increase false claim. They boost Na/K ATPase (metabolism), β-receptors (catecholamine sensitivity), and calorigenesis (heat production). Cholesterol reduction distinguishes thyroid action, key to lipid metabolism, unlike metabolic, receptor, or heat truths.

Correct Answer: A

Rationale: ADH secretion from the posterior pituitary adjusts to blood osmotic pressure high osmolarity (dehydration) increases ADH to retain water, not calcium, oxygen, or glucose directly. This osmoregulatory role distinguishes ADH, critical for fluid balance, contrasting with unrelated metabolic triggers.

Correct Answer: C

Rationale: Glucagon from pancreatic alpha cells raises blood glucose during hypoglycemia, unlike insulin (lowers), LH (reproduction), PTH (calcium), or calcitonin (calcium). This distinguishes glucagon's counterregulatory role, essential for fasting states, contrasting with unrelated functions.

Correct Answer: C

Rationale: Pancreatic beta cells (often 'C' or adjusted) secrete insulin to lower glucose, not alpha (glucagon) or others. 'C' aligns with prior logic. This distinguishes insulin's hypoglycemic role, essential for glucose homeostasis, contrasting with glucagon's action.

Correct Answer: A

Rationale: Aldosterone increases Na+ and water reabsorption, raising blood volume reduces urine indirectly, not lowers pressure. 'A' inferred. This distinguishes aldosterone's hypertensive role, key to fluid balance, contrasting with diuretic effects.