Which statement correctly describes the blood on the left side of the heart?

Which statement correctly describes the blood on the left side of the heart?

• A. It is low in oxygen and high in carbon dioxide.
• B. It pumps deoxygenated blood to the lungs.
• C. It is high in oxygen and low in carbon dioxide.
• D. It receives blood from the systemic circulation.

Answer: (C)

The left side of the heart carries oxygen-rich blood that has just been oxygenated in the lungs and is ready to be delivered to the body. This blood is high in oxygen and low in carbon dioxide, which is why the correct statement describes it as high in oxygen and low in carbon dioxide. The left side receives blood from the lungs via the pulmonary veins and pumps it into the systemic circulation through the aorta. In contrast, the right side handles oxygen-poor blood returning from the body and sends it to the lungs for oxygenation, so the other options don’t fit.

The left side of the heart carries oxygen-rich blood that has just been oxygenated in the lungs and is ready to be delivered to the body. This blood is high in oxygen and low in carbon dioxide, which is why the correct statement describes it as high in oxygen and low in carbon dioxide. The left side receives blood from the lungs via the pulmonary veins and pumps it into the systemic circulation through the aorta. In contrast, the right side handles oxygen-poor blood returning from the body and sends it to the lungs for oxygenation, so the other options don’t fit.