A patient becomes dizzy after standing quickly from bed. Which cardiovascular response normally helps maintain blood pressure?
Correct answer: A. Increased heart rate and peripheral vasoconstriction
- A. Increased heart rate and peripheral vasoconstriction
- B. Decreased heart rate and peripheral vasodilation
- C. Reduced sympathetic activity and venous pooling
- D. Lower contractility and increased capillary filtration
Explanation
Standing causes temporary venous pooling in the lower limbs, reducing venous return. The baroreceptor reflex responds by increasing sympathetic activity, heart rate, contractility and peripheral vasoconstriction to support blood pressure.
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About Cardiovascular System
The cardiovascular system covers the chambers, valves and major vessels of the heart, the cardiac cycle, conduction pathway, blood pressure and the circulation through pulmonary and systemic circuits. It also explains artery, vein and capillary structure, exchange at capillary beds, and how the cardiac cycle differs from general blood flow.
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