The passage describes the structure and function of the human circulatory system.
Complete the passage by writing a suitable word in each blank space.
Blood is pumped away from the heart in muscular blood vessels called ...................................................... . These vessels have thick, elastic walls to withstand high pressure.
Blood returns to the heart in vessels called ...................................................... , which contain ...................................................... to prevent the backflow of blood.
The exchange of nutrients and gases between the blood and tissue cells occurs across the very thin walls of ...................................................... , which are only one cell thick.
The muscular chamber of the heart that pumps oxygenated blood to the body is the ...................................................... ventricle.
The blood vessel that carries deoxygenated blood from the right ventricle to the lungs is the ...................................................... artery.
In the lungs, office diffuses into the red blood cells where it binds to the protein ...................................................... .
The oxygenated blood is then pumped out of the heart to the rest of the body through the major artery called the ...................................................... .
