ANATOMY
CHEST AND CARDIOVASCULAR
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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When the Ventricles contract
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it contracts all at the same time
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it contracts from the top to bottom
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it contracts from the bottom to the top
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it doesn’t contract at all
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Explanation:
Detailed explanation-1: -The contraction begins in the upper two chambers of the heart, called the atria, and then proceeds to the lower two chambers, the ventricles. A complete contraction and relaxation of the heart is a single heartbeat, also called a cardiac cycle.
Detailed explanation-2: -Also, the top-down direction of atrial contraction maintains a unidirectional flow of blood. The ventricles, on the other hand, contract starting from the bottom going up.
Detailed explanation-3: -This leads to a ‘bottom-up’ contraction of the ventricles, forcing blood up and out into the pulmonary artery (right) and aorta (left). The atria then re-fill as the myocardium relaxes.
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