ANATOMY
CHEST AND CARDIOVASCULAR
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which chambers contract during the first part of the Cardiac Cycle?
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Left & right ventricles
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Left & right atria
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Left atrium & ventricle
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Right atrium & ventricle
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Explanation:
Detailed explanation-1: -After the ventricle fills and transitions to contracting, the pressure eventually exceeds that of the blood vessels. This gradient closes the mitral valve, which marks the beginning of systole and causes the first heart sound (in concert with the tricuspid valve), denoted as S1.
Detailed explanation-2: -The oxygenated blood returns to the heart via the pulmonary veins and enters the left atrium. The left atrium contracts and pumps the blood through the mitral valve into the left ventricle. Finally, the left ventricle contracts and pushes the blood into the aorta.
There is 1 question to complete.