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catabolism

The various kinds of proteins, polysaccharides and fats are broken down into their component building blocks, which are relatively few in number.*

Building block molecules

Common degradation product c acid cycle to er, carbon dioxide,

Metabolism accomplishes, among other things, the conversion of food energy into the energy of motion. Regulation of metabolism allows the abrupt transition from a state of rest to the breath-taking power and grace of athletic competition.

(European champs by Paul J. Sutton/Duomo; line art by J/B Woolsey Associates)

All is flux, nothing stays still. Nothing endures but change.

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