Which chambers of the heart are responsible for pushing blood out?

The left and right ventricles are the chambers of the heart responsible for pushing blood out into the circulation. The ventricles are muscular chambers that contract during systole, which is the phase of the heartbeat when blood is pumped out.

The left ventricle pumps oxygen-rich blood into the aorta, distributing it throughout the body, while the right ventricle sends oxygen-poor blood to the lungs through the pulmonary artery for oxygenation. This process is vital for maintaining circulation and ensuring that oxygen is delivered to tissues and carbon dioxide is removed.

In contrast, the atria (referred to in the other options) serve primarily as receiving chambers. The right atrium collects deoxygenated blood from the body, and the left atrium receives oxygenated blood from the lungs but does not have the muscular strength to pump blood out on its own. Their primary role is to ensure that blood flows into the ventricles, which are crucial for the active pumping of blood.