Blood pressure is highest in the ___ and lowest in the ___

Correct Answer: B

Rationale: Blood pressure is highest in the aorta (B, ~120/80 mmHg) and lowest in the vena cavae (~0-5 mmHg) as it returns to the heart. Capillaries (A, C) are intermediate (~25 mmHg), arterioles (D) higher than capillaries.

Correct Answer: C

Rationale: The common iliac artery is part of systemic circulation (C), supplying the lower body. Pulmonary (A) is lungs, coronary (B) is heart, pelvic (D) isn’t a circuit.

Correct Answer: D

Rationale: Vitamin K (D) is essential for blood clotting (synthesis of factors II, VII, IX, X). Vitamins A (vision), D (calcium), and E (antioxidant) have less direct blood roles.

Correct Answer: B

Rationale: The vena cava (B) has the lowest pressure (~0-5 mmHg) as blood returns to the heart. Veins (A, ~10 mmHg), capillaries (D, ~20 mmHg), and aorta (C, ~100 mmHg) have higher pressures.

Correct Answer: B

Rationale: Baroreceptor stimulation (e.g., high BP) triggers parasympathetic activation, lowering BP and heart rate (B). A and C increase BP, D is mixed.