Question

when the ______ of the heart contracts, blood is pumped into the systemic circuit.

○ left ventricle

○ right ventricle

○ left atria

○ right atria

Explanation:

The systemic circuit carries oxygenated blood from the heart to the body. The left ventricle pumps oxygenated blood into the aorta, which distributes it to the systemic circuit. Atria receive blood, not pump it to the systemic circuit; the right ventricle pumps to the pulmonary circuit.

Answer:

A. left ventricle