Blood pressure is lowest in the
Correct answer: D. venae cavae
- A. aorta
- B. arteries
- C. arterioles
- D. venae cavae
Explanation
Pressure falls steadily through arteries, arterioles and capillaries as energy is lost to friction, reaching near zero in the great veins. This is why venous return depends on valves, muscle contraction and breathing rather than on pressure.
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The human heart is a four chambered muscular pump that maintains double circulation through the pulmonary and systemic circuits. Questions cover atria, ventricles, valves, major blood vessels, the cardiac cycle, pressure changes, the conduction system and ECG, while distinguishing arteries and veins from the chambers that receive or eject blood.
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