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The cells of the human body work as well as they do because they are adapted to do so. These adaptations are encoded into human DNA, and then the complex hormonal bath of the human body triggers individual cells to differentiate into specific functions.
All of these cells share certain supporting functions. All human cells have a metabolism; they burn ATP to generate chemical energy.
They are all bound by cell membranes, and these membranes work continually to allow crucial nutrients to pass while excluding unwanted material and waste products. All human cells share other structural elements; most have a nucleus.
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