Which chamber forms the base of the heart?

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Multiple Choice

Which chamber forms the base of the heart?

Explanation:
The base is the heart’s posterior surface, and it is formed mainly by the left atrium. The left atrium sits behind the other chambers and gives rise to the large posterior wall where the four pulmonary veins enter. A small portion of the base can be contributed by the right atrium, but the dominant builder of the base is the left atrium. In contrast, the apex and the anterior surfaces are formed by the left ventricle, and the right ventricle mainly contributes to the anterior-right aspects.

The base is the heart’s posterior surface, and it is formed mainly by the left atrium. The left atrium sits behind the other chambers and gives rise to the large posterior wall where the four pulmonary veins enter. A small portion of the base can be contributed by the right atrium, but the dominant builder of the base is the left atrium. In contrast, the apex and the anterior surfaces are formed by the left ventricle, and the right ventricle mainly contributes to the anterior-right aspects.

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