A patient has repeated blood pressure readings of 170/100 mmHg. Which response is expected from the arterial baroreceptors?
Correct answer: D. Reduced sympathetic activity
- A. Increased sympathetic activity
- B. Increased heart rate
- C. Reduced parasympathetic activity
- D. Reduced sympathetic activity
Explanation
High arterial pressure stretches the carotid and aortic baroreceptors, increasing signals to the cardiovascular centre. The resulting reduction in sympathetic activity lowers heart rate, contractility and vasoconstriction. The other choices would tend to raise blood pressure.
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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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