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Internal environment. Homeostasis.
The basic living unit of the body is the cell.
Each organ is an aggregate of many different cells held together by intercellular supporting
structures.
Each type of cell is especially adapted to perform one particular function.
For instance, the RBC, 25 trillion (25 1012) in all, transport oxygen from the lungs to the
tissues and carbon dioxide from tissues to the lungs (RBC perhaps the most abundant cells
type). There are perhaps another 75 trillion cells.
The entire body contains about 100 trillion cel
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