Which circuit transports blood between the heart and lungs?

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Circulation between the heart and lungs is carried by the pulmonary circuit. It starts with deoxygenated blood being pumped from the right ventricle into the lungs via the pulmonary arteries, where gas exchange occurs and blood picks up oxygen. The oxygenated blood then returns to the heart through the pulmonary veins into the left atrium. This pathway specifically handles the lungs, separating it from the systemic circuit that sends blood to the rest of the body. The other terms aren’t circuits: the lumen is simply the inside space of a vessel, the fibrous outer layer is a structural part of the vessel wall, and chyle is lymphatic fluid—none describes a blood flow pathway between the heart and lungs.