Which is the part of heart that when it contracts sends blood to brain?

The left atrium is the part of the heart that when it contracts sends blood to the brain. The left atrium is one of the four chambers of the heart, and it is located on the left side of the heart. The left atrium receives blood from the lungs through the pulmonary veins, and it then pumps the blood to the left ventricle. The left ventricle then pumps the blood to the aorta, which is the main artery that supplies blood to the body, including the brain.