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Multiple Choice

Which organ belongs to the pulmonary circuit?

The lungs are the organ in the pulmonary circuit. This circuit is dedicated to moving blood between the heart and the lungs for gas exchange: deoxygenated blood leaves the right ventricle via the pulmonary arteries to the lungs, where it releases carbon dioxide and picks up oxygen, and then oxygenated blood returns to the left atrium through the pulmonary veins. The other organs listed (liver, brain, kidneys) are part of the systemic circulation, which serves the rest of the body, not the lungs.

The lungs are the organ in the pulmonary circuit. This circuit is dedicated to moving blood between the heart and the lungs for gas exchange: deoxygenated blood leaves the right ventricle via the pulmonary arteries to the lungs, where it releases carbon dioxide and picks up oxygen, and then oxygenated blood returns to the left atrium through the pulmonary veins. The other organs listed (liver, brain, kidneys) are part of the systemic circulation, which serves the rest of the body, not the lungs.