Which side of the heart supplies blood to the pulmonary circuit?

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The right side handles sending blood to the lungs, starting the pulmonary circuit. Deoxygenated blood returns from the body into the right atrium, moves to the right ventricle, and is pumped through the pulmonary arteries to the lungs for gas exchange. Oxygenated blood then returns to the heart’s left atrium via the pulmonary veins, and the left side takes over for the systemic circuit. So the right heart is the one that supplies blood to the pulmonary circuit.