HUMAN BLOOD CIRCULATION

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THE CIRCULATORY SYSTEM consists of the heart and blood vessels,which together maintain a continuous flow of blood around the body .The heart pumps oxygen-rich blood from the lungs to all parts of the body through a network of tubes called Arteries, and smaller branches called arterioles.Blood returns to the heart via small vessels called venules ,which lead in turn into larger tubes called veins.Arterioles and venules are linked by a network of tiny vessels called capillaries;where the exchange of oxygen and carbon dioxide between blood and body cells takes place.
Blood has four main components ;red blood cells ,white blood cells,platelets, and liquid plasma.
BLOOD CIRCULATION

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