Composition
of the Blood
The blood is a mixture of cells, fluid, proteins and
metabolites.
Blood has four major elements
Red blood cells (RBC's or erythrocytes)
transport oxygen from the lungs to organs and peripheral
sites.
White blood cells (or leukocytes)
have a defensive role in destroying invading organisms e.g.
bacteria and viruses
assist in the removal of dead or damaged tissue cells.
Platelets (or thrombocytes)
the first line of defence against damage to blood vessels.
they adhere to any defects and assist in the clotting
process.
Plasma
the proteinaceous substance in which the other three
cellular elements circulate.
it carries nutrients, metabolites antibodies,
proteins involved in blood clotting, as well as
hormones and other molecules to all parts of the body.
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