The pulmonary circuit transports deoxygenated blood to the lungs for oxygenation and returns oxygenated blood to the heart.
The pulmonary circuit is the one that transports deoxygenated blood away from the heart to the lungs for oxygenation and then returns oxygenated blood back to the heart.
For example, in the pulmonary circuit, deoxygenated blood leaves the right ventricle through the pulmonary arteries to reach the lungs, where it picks up oxygen.
On the other hand, in the systemic circuit, oxygenated blood is transported from the heart to the body tissues and then returns relatively deoxygenated blood and carbon dioxide back to the heart.
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