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galina1969 [7]
3 years ago
11

When a muscle contracts, it performs work. It does this by

Physics
1 answer:
Leya [2.2K]3 years ago
6 0
The answer is A.
The brain sends signals by chemical reactions that occur in the neurons to the muscle cells.
The muscle cells, after receiving the signals sent by brain, contract and expand necessarily to execute the action, in other words, it performs work.
Hope this helps you! :)
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