The chemical signaling system that relies on blood transport typically uses chemicals called

Correct Answer: B

Rationale: Hormones, secreted by endocrine glands, travel via blood to distant targets, regulating processes like metabolism (e.g., insulin). Neurotransmitters act locally at synapses, not via blood neural signaling. Enzymes catalyze reactions, not signaling via transport. Ions (e.g., Ca²⁺) mediate intracellular signals, not blood-based communication. Hormones' systemic delivery distinguishes them, key to endocrine function, unlike local, catalytic, or ionic roles.

Correct Answer: C

Rationale: ADH increases kidney water reabsorption and constricts blood vessels (V1 receptors), raising blood pressure volume and resistance boost. Decreased reabsorption contradicts ADH diuresis lowers pressure. Dilation would drop pressure, opposing constriction. Increased reabsorption with constriction distinguishes ADH's action, critical for pressure/fluid regulation, unlike decreasing or dilatory errors.

Correct Answer: C

Rationale: Growth hormone (GH) doesn't promote glucose metabolism it inhibits uptake, raising blood glucose (insulin antagonist), favoring fat metabolism (lipolysis) instead. It boosts amino acid entry and protein synthesis (growth). Glucose metabolism is insulin's domain GH spares it. Fat metabolism promotion distinguishes GH's role, key to its anabolic shift, unlike amino acid, protein, or glucose claims.

Correct Answer: B

Rationale: Calcitonin, from thyroid C-cells, lowers high blood calcium by depositing it into bones opposes resorption. PTH (parathyroid) raises calcium, opposite effect. Oxytocin (hypothalamus) aids labor, unrelated. Glucagon (pancreas) raises glucose, not calcium. Calcitonin's bone storage distinguishes it, critical for calcium balance, unlike raising, reproductive, or glucose hormones.

Correct Answer: D

Rationale: Aldosterone increases blood pressure by targeting kidney tubules for sodium/water reabsorption (less urine) and potassium excretion mineralocorticoid action. Decreasing blood pressure contradicts raises it via volume. Mineralocorticoid status and urine reduction are true. Pressure increase distinguishes aldosterone, critical for RAAS, unlike erroneous decrease.