MEDICAL
HEART AND PERICARDIUM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which factor for regulating the ventricles pump at the same times is known as the degree of stretch of the heart before contraction?
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Contractility
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Afterload
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Preload
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None of the above
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Explanation:
Detailed explanation-1: -The answer is a. Stretching of the myocardium of the ventricles during ventricular diastole is referred to as preload. An increase in preload leads to an increased force of contraction in the ventricle.
Detailed explanation-2: -Factors that affect preload include venous return, atrial contraction, heart rate, resistance from valves, and ventricular compliance.
Detailed explanation-3: -Preload is the initial stretching of the cardiac myocytes (muscle cells) prior to contraction. It is related to ventricular filling. Afterload is the force or load against which the heart has to contract to eject the blood.
There is 1 question to complete.