What is function of atrium

Function of right atrium The right atrium is one of the four chambers of the heart. The heart is comprised of two atria and two ventricles. Blood enters the heart through the two atria and exits through the two ventricles. Deoxygenated blood enters the right atrium through the inferior and superior vena cava. The right side of the heart then pumps this deoxygenated blood into the pulmonary arteries around the lungs. There, fresh oxygen enters the blood stream, and the blood moves to the left side of the heart, where it is then pumped to the rest of the body. There is a major difference between the heart of a developing fetus and that of a fully mature adult: a fetus will have a hole in the right atrium. This allows blood to flow straight through to the left atrium. This is significantly important to a fetus' circulatory health. While in the womb, the fetus draws oxygenated blood from its mother. Once born, lungs become necessary and the connection between the two atria closes. Function of left atrium The left atrium is one of the four chambers of the heart, located on the left posterior side. Its primary roles are to act as a holding chamber for blood returning from the lungs and to act as a pump to transport blood to other areas of the heart. The walls of the left atrium are slightly thicker than the walls of the right atrium. Oxygen-rich blood from the lungs enters the left atrium through the pulmonary vein. The blood is then pumped into the left ventricle chamber of the heart through the mitral valve. From there, the blood is ready to be pumped into the body to deliver oxygen-rich blood to all bodily tissues. Mitral valve prolapse is a common affliction in which the mitral valve between the left atrium and left ventricle does not close properly. This condition does not typically require treatment; however, some patients with mitral valve prolapse can develop more serious conditions that require treatment. One such condition is mitral valve regurgitation, in which blood leaks back into the left atrium through the mitral valve.

Atria are thin, less muscular walls and smaller than ventricles. These are the blood-receiving chambers that are carried to the heart by the large veins.
When blood returns to the heart from the body, it fills the right atrium. The tricuspid valve then opens, allowing blood to be pumped to the ventricle below. Then the ventricle contracts and pumps blood through the pulmonary valve to the lungs. The blood returns from the lungs and then fills the left atrium. The mitral valve then opens, allowing blood to pass from the left atrium to the ventricle below. The left ventricle then contracts and the aortic valve opens, allowing blood to travel through the aorta to blood vessels throughout your body.