Of the blood flow The circulatory system transports oxygen, carbon dioxide, nutrients, waste, blood cells and hormones through the body. Regular blood circulation is ensured by regular contraction of the heart, which ensures that the total amount of blood in the body is pumped through the circulatory system approximately once every minute (at rest).
The blood circulation
Every cell in the human organism needs oxygen and energy. The blood serves as a medium to transport the important substances close to the cells. The process of diffusion then allows the mass transfer between the cell and its immediate environment. In this way, waste materials are also transported via the blood, in particular carbon dioxide, which arises during cell respiration and has to be removed from the body.
The blood circulation can be considered in two functional subunits: pulmonary circulation and body circulation.
Of the Pulmonary circulation (small circulation) pumps the blood over the right heart to the lungs. At the pulmonary alveoli, the oxygen in the blood and carbon dioxide diffuses back into the pulmonary alveoli. The oxygen-rich blood flows back to the heart and is transferred from the left ventricle to the heart Kцrperkreislauf (big circuit) pumped. The blood flows through the arteries, arteries and arterioles to the capillaries via the main artery (aorta). The blood capillaries go through all the tissues and supply the individual cells with the necessary substances.
Within the circulatory system it is still possible to differentiate between two types of blood vessels. The arteries oxygenated blood from the heart passes through the body, and veins bring oxygenated blood back to the heart. There the cycle begins again.