What chambers are the pumping of heart?

The heart is a muscular organ responsible for pumping blood throughout the body. It consists of four chambers: two atria (singular atrium) and two ventricles. The atria are the upper chambers, while the ventricles are the lower chambers.

The right atrium receives deoxygenated blood from the body through two large veins called the superior vena cava (which brings blood from the upper body) and the inferior vena cava (which brings blood from the lower body). This blood is then pumped into the right ventricle. The right ventricle pumps the deoxygenated blood into the lungs through the pulmonary artery, where it picks up oxygen and releases carbon dioxide.

The oxygenated blood from the lungs returns to the heart through four pulmonary veins, which empty into the left atrium. The left atrium pumps the oxygenated blood into the left ventricle. The left ventricle pumps the oxygenated blood out to the body through the aorta, the largest artery in the body.

The pumping action of the heart is controlled by electrical signals generated by the heart's natural pacemaker, the sinoatrial (SA) node. The SA node is located in the right atrium and initiates the electrical impulses that cause the heart to contract.