There is more blood in the systemic circuit than the pulmonary circuit. Even the arterial portion of the systemic circuit is larger than the entire pulmonary circuit, because the pulmonary circuit only delivers blood to the lungs, and the systemic circuit supplies the rest of the body.
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Blood enters the systemic arteries from the left ventricle. This blood is oxygen-rich.
Arteries carry blood to all parts of the body.
Systemic Arteries carry oxygen rich blood (also called oxygenated blood). Pulmonary Arteries carry oxygen poor (deoxygenated) blood
ventricular systole
arteries are blood vessels that take blood away from your heart and into your body. First the blood passaes through the right atrium then into the arteries where the blood is then deoxygenated and the oxygen is given to all your muscles.
Pulmonary Arteries lead from the heart to the lungs. Systemic arteries go everywhere else. Consequently, the pulmonary arteries are usually slightly smaller and thinner. There is also less of them.