Which surface is on the side above the diaphragmatic surface?

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Multiple Choice

Which surface is on the side above the diaphragmatic surface?

Understanding how the heart sits in the chest helps explain this. The diaphragmatic surface is the inferior aspect of the heart that rests on the diaphragm. The side that sits laterally and extends above that bottom edge is the lateral surface. So when you move from the bottom upward along the side of the heart, you’re on the lateral surface, which is why this is the best answer.

For context, the anterior (sternocostal) surface faces the front of the chest, mainly formed by the right ventricle; the posterior (base) surface faces backward, mainly formed by the left atrium.

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