The main part of human beings and other living beings

Blood is composed of a clear, straw color, watery fluid called plasma in which several different types of blood cell are suspended. Plasma normally constitute 55% of the volume of The remaining mining 45% is accounted for by the cellular fraction of blood the two fraction of blood , blood cells and plasma, can be separated by centrifugation or gravity when blood is allowed to stand because the cell is heavier than plasma , they sink to the bottom of any sample.
Blood makes up about 7% of body weight. This proportion is less in women and considerably greater in children, gradually decreasing until the adult level is reached.

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