Functions of the Blood

Functions of the Blood

The circulating blood is of fundamental importance in maintaining homeostasis. This life-giving fluid brings nutrients and oxygen to the cells and carries away waste. The heart pumps blood continuously through a closed system of vessels. Blood is classified as a connective tissue because it consists of cells suspended in an intercellular background material, or matrix. Blood cells share many characteristics of origination and development with other connective tissues. However, blood differs from other connective tissues in that its cells are not fixed in position; instead, they move freely in the plasma, the liquid portion of the blood. Whole blood is a viscous (thick) fluid that varies in color from bright scarlet to dark red, depending on how much oxygen it is carrying. (It is customary in drawings to color blood high in oxygen as red and blood low in oxygen as blue.) The blood volume accounts for approximately 8% of total body weight. The actual quantity of circulating blood...
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