Work Step by Step
Option A is incorrect. The right atrium contracts, sending oxygen-poor blood to the right ventricle. Contraction of the right ventricle sends blood into the pulmonary artery to take the oxygen-poor blood to the lungs to pick up oxygen. Option B is incorrect. The right atrium contains oxygen-poor blood whereas the left atrium holds oxygen-rich blood collected from the lungs via the pulmonary vein. Option D is incorrect. The right ventricle pumps oxygen-poor blood to the lungs to pick up oxygen. Option C is correct. The left atrium collects oxygen-rich blood coming from the lungs via the pulmonary vein. When the left atrium contracts, blood is squeezed into the left ventricle to be distributed to the rest of the body.