Angiotensin II increases blood pressure by increasing:

Correct Answer: A

Rationale: Angiotensin II constricts arterioles and stimulates aldosterone release (A), increasing BP via resistance and volume. B, C, D mismatch its effects.

Correct Answer: C

Rationale: The aorta passes through the diaphragm at the aortic hiatus, level T12 (C). T8 (A) is the inferior vena cava, T10 (B) the esophagus, and C6 (D) is cervical.

Correct Answer: A

Rationale: Fever increases metabolic rate, raising heart rate (A, tachycardia) via sympathetic activation. Appetite (B) decreases, sweating (C) increases, and urinary output (D) may decrease due to dehydration.

Correct Answer: C

Rationale: Arterioles (C) have the highest resistance due to small diameter and smooth muscle control (Poiseuille’s law). Aorta (A) and arteries (B) have less, veins (D) minimal.

Correct Answer: A

Rationale: The liver receives the most blood (~1.5 L/min, A), though kidneys (C, ~1.2 L/min) are close. Brain (B, ~0.75 L/min) and heart (D, ~0.25 L/min) get less.