Final answer:
The pulmonary circuit involves blood flow from the heart to the lungs, where it gets oxygenated before returning to the heart.
Step-by-step explanation:
The pulmonary circuit involves blood flow from the heart specifically to the lungs. After blood returns from the systemic circuit, it enters the right atrium, carrying less oxygen and more carbon dioxide, having delivered oxygen to the tissues of the body. This deoxygenated blood then moves into the right ventricle, from where it is pumped through the pulmonary arteries to the lungs. Here, carbon dioxide is exchanged for oxygen. The now oxygenated blood returns to the left atrium of the heart via the pulmonary veins, completing the pulmonary circuit.
Answering the student's question directly: The pulmonary circuit involves blood flow from the heart to the lungs for oxygenation and not to the body, liver, or brain.