PHYSIOLOGY
CARDIOVASCULAR PHYSIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Atrial contraction contributes to about ____ to the filling of the ventricles.
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80%
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20%
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5%
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100%
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Explanation:
Detailed explanation-1: -Active atrial contraction forces additional volumes of blood into the ventricles (often referred to as “atrial kick"). The atrial kick contributes a significant volume of blood toward ventricular preload (approximately 20%).
Detailed explanation-2: -The contribution of left atrial systole in left ventricular filling is highly dependent on age and varies between 20% (age <35) and 55% (age >60).
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