Which chambers of the heart pump blood out?

The ventricles are the chambers of the heart responsible for pumping blood out of the heart and into the circulatory system. There are two ventricles: the right ventricle and the left ventricle. The right ventricle pumps deoxygenated blood to the lungs through the pulmonary artery, where it receives oxygen. The left ventricle, on the other hand, pumps oxygenated blood to the rest of the body through the aorta, which is critical for delivering oxygen and nutrients to tissues and organs.

The atria, in contrast, are the upper chambers of the heart that receive blood coming into the heart but do not pump it out. Veins are blood vessels that transport blood towards the heart, while capillaries are the small blood vessels that facilitate the exchange of oxygen, carbon dioxide, nutrients, and waste products between blood and tissues. Hence, it is the ventricles that play the key role in the outward movement of blood from the heart.