What is the function of the pulmonary circuit?

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The pulmonary circuit moves blood between the heart and the lungs to enable gas exchange. It starts with the right ventricle pumping oxygen-poor blood to the lungs via the pulmonary arteries. In the lungs, blood picks up oxygen and releases carbon dioxide, then returns to the heart through the pulmonary veins into the left atrium as oxygen-rich blood. This sequence—sending deoxygenated blood to the lungs and returning oxygenated blood to the left atrium—defines the pulmonary circuit, making the described option the correct one. The other choices mix in aspects of the systemic circuit or omit part of the pulmonary path (for example, sending blood to the brain or only returning from the lungs), which is why they’re not accurate descriptions of the pulmonary circuit’s function.