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Question

Muscle contraction is possible because

A
Number of muscle fibers stimulated
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B
Number of motor units stimulated
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C
Frequency of action potentials in each motor unit
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D
Contractile proteins which contract and relax to cause movement.
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Solution

The correct option is D Contractile proteins which contract and relax to cause movement.
Muscle contraction is possible because of muscles contain special protein called contractile proteins which contract and relax to cause movement.

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