The atrium where blood enters the heart is a collecting camber. It then pumps into the ventricle and out of the heart. Newly oxygenated blood returns to the left atrium, the top and left side of the heart. It is ten pumped through the mitral valve into the left ventricle. It then is pumped throughout the body to nourish the body s cells.
Blood is so vital as it transports oxygen nutrients and removes waste products.
The entire circulatory system takes sixty seconds and will continue your entire lifetime. It is critical that blood flows in the correct direction from the chambers by contractions. The valves protect the heart from an incorrect flow. They are flaps that separate each chamber. At the appropriate time they open to allow blood to flow through, and close to prevent the blood form following backwards.