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| 16.20 | System: muscular and motion systems | |
| While the human skeleton of an adult consists of more than 200 bones, its function is closely linked to the colonies of contractor-expander cells, or muscle cells. | ||
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| The skeleton works together with the muscles in enabling the body to move. The bones of the shoulders and arms, for instance, serve as levers against which the muscles that move the arm can pull. | ||
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