Blood is the fluid necessary for life. It flows through the arteries, capillaries and veins of our body, and consists of a liquid part, called plasma, and blood cells that float in the plasma. Adult body has about 6.5 liters of blood. The blood is the most perfect transfer system: it brings food and oxygen to each cell, and takes out the unnecessary products, delivers hormones and other substances, helps the body to fight infection and to adapt the body heat. Types of Blood Cells There are three types of blood cells. They are: Red blood cells, which give the red color to the blood and carry oxygen, White blood cells , of which there are several types and whose task is to fight infection, and finally, the blood plates (Platelets) which help the blood to clot, thus preventing excessive bleeding and blood loss from injured blood vessel. All blood cells are created in the bone marrow. If you look at the open bone, you will see in it reddish-gray cav...
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