Which circuit carries oxygen-poor blood from the heart to the lungs?

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Circulatory loops divide blood flow into where it’s oxygenating the lungs versus nourishing the body. The pulmonary circuit is the path that moves blood between the heart and the lungs. From the right ventricle, oxygen-poor blood is pumped into the pulmonary trunk and then to the lungs for gas exchange; after picks up oxygen, it returns to the heart—left atrium—via the pulmonary veins. The systemic circuit, on the other hand, sends oxygen-rich blood from the left ventricle to the rest of the body and brings deoxygenated blood back to the right atrium. The coronary circuit serves the heart muscle itself, and the renal circuit goes to the kidneys. So, the circuit that carries oxygen-poor blood from the heart to the lungs is the pulmonary circuit.