HOW DOES THE HEART WORK?

The right ventricle pumps the oxygen-poor blood to the lungs through the pulmonary valve. The left atrium receives oxygen-rich blood from the lungs and pumps it to the left ventricle through the mitral valve. The left ventricle pumps the oxygen-rich blood through the aortic valve out to the rest of the body.

The right venticle pumps the oxygen poor bloodto the lungs through the pulmonary valve. The left atrium recieves oxygen-rich blood from the lungs and pumps it to the left ventricle through the mitral valve

answer(b) keep oxygenated and deoxygenated blood separate;