Why are muscles able to contract and relax to bring about movement ?
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Muscles are special fibres in the body that contract and relax to cause movements. Movement is caused by the contraction and relaxation of muscles. When one muscle contracts, the other relaxes and this causes displacement. The muscles of our heart are called involuntary muscles as they don't work according to our will.
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9
Answer:
Because they have a contractile protein which helps them to contract and relax to bring about movement....
Hope it helps...
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