Which one of the following statements about the human circulatory system is most

Question

Which one of the following statements about the human circulatory system is most likely to be false? a. If the opening of the left atrioventricular valve is narrowed (mitral stenosis), blood pressure in the pulmonary circulation will be elevated. b. Near the end of ventricular diastole, blood pressure in the atria is higher than blood pressure in the ventricles. c. Blood pressure in jugular vein (in the neck) is higher than blood pressure in vena cava. d. Blood pressure in the pulmonary artery is lower than blood pressure in the aorta. e. A sudden drop in arterial blood pressure is likely to cause venous vasodilation.

Explanation / Answer

The correct answer is (e). A sudden drop in arterial blood pressure is likely to cause venous vasodilation.

The reason is that when cardiac output causes increase in arterial blood pressure and this increase in arterial blood pressure will result in venous vasodilation.

Thus inspite of drop in aterial blood pressure, increase in arterial blood pressure is likely to cause venous vasodilation.

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