ANATOMY
CHEST AND CARDIOVASCULAR
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following causes an increase in cardiac output?
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Increase in contractility and decreased in preload
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increase in afterload
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increase in both contractility and preload
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increased in preload and decrease in contractility
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Explanation:
Detailed explanation-1: -In Chapter 5.8, we learned about the Frank–Starling Law of the Heart: increased filling pressure stretches the heart and increases its force of contraction. Increasing the force of contraction expels more blood from the left ventricle, so that cardiac output increases when the preload increases.
Detailed explanation-2: -Contractility describes the forcefulness of the heart’s contraction. Increasing contractility reduces end-systolic volume, which results in a greater stroke volume and thus greater cardiac output.
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