PHYSIOLOGY
CARDIOVASCULAR PHYSIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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volume of blood in the ventricles
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volume of blood in the atria during diastole
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resistance to blood flow out of the ventricle during systole
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pressure of left ventricle during diastole
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Detailed explanation-1: -Afterload is the pressure that the heart must work against to eject blood during systole (ventricular contraction). Afterload is proportional to the average arterial pressure. As aortic and pulmonary pressures increase, the afterload increases on the left and right ventricles respectively.
Detailed explanation-2: -Afterload is the pressure against which the heart must work to eject blood during systole (systolic pressure). The lower the afterload, the more blood the heart will eject with each contraction.
Detailed explanation-3: -Afterload is defined as the force opposing fiber shortening during ventricular ejection. It is not synonymous with systemic arterial pressure, vasomotor tone, or vascular resistance. Instead, it should be thought of as the tension or stress in the ventricular wall during ejection.