Muscle contraction is possible because

Number of muscle fibers stimulated

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Number of motor units stimulated

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Frequency of action potentials in each motor unit

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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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Similar questions

Asserion(A): At cellular level, muscle fibres contract and show appropriate response on receiving impulses.

Reason(R): Muscle fibres contract because of change of structure of muscle proteins at cellular level.

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