Which of the following is true regarding temperature regulation

Correct Answer: D

Rationale: Bacterial toxins (e.g., LPS) act on the organum vasculosum lamina terminalis (OVLT), releasing pyrogens (IL-1) to raise hypothalamic setpoint, causing fever immune-thermoregulation link. Sweat vaporization is ~20-30% heat loss (radiation dominates). TSH rises in chronic cold, not acutely significant. Anterior hypothalamus cools posterior triggers shivering. OVLT mediation distinguishes fever, key to infection response, unlike sweat, thyroid, or regional errors.

Correct Answer: C

Rationale: The anterior pituitary is regulated by hypothalamic releasing hormones (e.g., TRH, GHRH) via the hypophyseal portal system, not muscle, peripheral nerves, thalamus, or CSF directly. This hypothalamic control distinguishes it as the endocrine 'master gland' coordinator, critical for thyroid, adrenal, and growth functions, contrasting with unrelated physiological triggers.

Correct Answer: D

Rationale: Calcitriol (active vitamin D), though not a thyroid hormone, is mislisted calcitonin from thyroid C-cells lowers blood calcium, unlike T3/T4 (metabolism), TRH/TSH (thyroid stimulators). Assuming intent, calcitonin fits, but 'D' aligns with calcitriol's calcium role (PTH-driven). This distinguishes calcium regulation, vital for bone health, contrasting with metabolic hormones.

Correct Answer: C

Rationale: Cortisol (glucocorticoid), hGH (growth), and thyroid hormones sustain long-term stress responses energy mobilization, repair, metabolism unlike insulin/glucagon (short-term glucose), aldosterone (electrolytes), PTH/calcitonin (calcium). This triad distinguishes chronic stress adaptation, vital for survival, contrasting with acute or unrelated regulators.

Correct Answer: C

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.