In the heart, oxygenated blood from the lungs first enters which chamber?

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Multiple Choice

In the heart, oxygenated blood from the lungs first enters which chamber?

Explanation:
Oxygenated blood from the lungs enters the heart through the left atrium. Blood returns from the lungs via the pulmonary veins and flows into the left atrium, the first chamber that receives this oxygen-rich blood. From there, it moves through the mitral valve into the left ventricle, which then pumps it to the rest of the body through the aorta. In contrast, the right atrium receives deoxygenated blood from the body via the superior and inferior vena cavae, feeding the right ventricle, which sends blood to the lungs. So the first chamber to receive blood that has been oxygenated in the lungs is the left atrium.

Oxygenated blood from the lungs enters the heart through the left atrium. Blood returns from the lungs via the pulmonary veins and flows into the left atrium, the first chamber that receives this oxygen-rich blood. From there, it moves through the mitral valve into the left ventricle, which then pumps it to the rest of the body through the aorta. In contrast, the right atrium receives deoxygenated blood from the body via the superior and inferior vena cavae, feeding the right ventricle, which sends blood to the lungs. So the first chamber to receive blood that has been oxygenated in the lungs is the left atrium.

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