Big Blood Circulation
It is the circulation of blood that starts in the left ventricle of the heart and ends in the right atrium. After oxygenated blood in the lungs passes from the left atrium to the left ventricle, the ventricle, which has a strong muscular wall, contracts and sends the blood within it to the aorta. The first vessels departing from the aorta are coronary vessels. Coronary vessels nourish the heart muscle. When the aorta emerges from the heart, it branches to the carotid artery for the upper part of the body, and provides blood to the capillaries of the head and arms, while another aortic branch delivers blood to the internal organs in the abdominal cavity and the capillaries in the legs in the lower part of the body. As the blood passes through the capillaries, it leaves most of the oxygen to the tissues and takes the carbon dioxide released by cellular respiration. Thin veins formed by the combination of capillaries transmit blood to larger veins. Oxygen-poor blood coming from the head, neck, and arms; upper main with a vein; Oxygen-poor blood from the trunk and legs It is delivered to the right atrium of the heart via the main vein.
