Explain how blood enters the heart (in what state) and how it travels to the lungs, back to the heart (in what state), and out to the body (in what state).

 Explain how blood enters the heart (in what state) and how it travels to the lungs, back to the heart (in what state), and out to the body (in what state).

Right atrium and ventricle receive and pump oxygen-poor blood from the body to the lungs.

Left atrium and ventricle receive oxygen-rich blood from the lungs and pump it throughout the body.

Arterial vessels carry oxygen-poor blood to the lungs and venous vessels carrying oxygen-rich blood back to the heart. Oxygen level of the blood carried in the pulmonary arteries is low and it is high in the pulmonary veins.

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