This allows materials to be exchange between the blood and cells in the blood. They don t have valves. The heart pushes blood into the Arteries leading to the lungs for oxygen. The Aorta branches out to the entire body to supply it with blood through the Capillaries. After materials have been exchanged in the Capillaries the blood returns to the heart in Veins.
Blood pressure is the force created by the heart to push the blood through the body.
This is usually caused by Blood Vessels that are being blocked. The heart is an involuntary muscle that constantly pumps blood through the body. It is a double pump with both pumps working at the same time. The Right side pumps oxygen poor blood to the lungs. The Left side pumps oxygen rich blood to the rest of the body.