Q: Which chambers of the heart form the left border of the heart?  

Answer: C

The heart is a muscular organ that pumps blood to various parts of the body. It is divided into four chambers, namely the right atrium, right ventricle, left atrium, and left ventricle. The left border of the heart is formed by the left atrium and left ventricle. This is because the left atrium is located superior and posterior to the left ventricle. The right ventricle is located anteriorly and forms the right border of the heart. The left atrium receives oxygenated blood from the lungs and pumps it into the left ventricle. The left ventricle then pumps the oxygenated blood into the aorta, which distributes it to the rest of the body.

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