Blood. What is it?
Very basically, the main constituents of blood are Plasma (55%) and cells (45%). Plasma is a straw coloured liquid consisting of 90% water. It is made up of plasma proteins, inorganic salts, nutrients, organic waste, hormones, enzymes, antibodies and gasses, each of which has its own function. The main function of plasma is the transportation of blood cells, nutrients, proteins, hormones and waste around the body. It also helps maintain temperature and PH balance.
There are three types of blood cells, White (Leukocytes), Red (Erythrocytes) and Platelets (Thrombocytes).
White blood cells are part of our immune system; they defend our bodies against infectious disease, bacteria, parasites etc. Again there are several types of white blood cell each with their own specific function.
Red blood cells are directly concerned with the transporting of oxygen from the lungs to all other body parts then transporting waste carbon dioxide from these parts back to the lungs.
Platelets are tiny cell fragments that play a vital part in the complex procedure of clotting the blood.
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