Read the following statements.
Statement I : The reaction time of the fibres can vary in different muscles.
Statement II : Ca⁺⁺ ions are pumped back to sarcoplasmic cisternae during relaxation.
In light of the given statements, choose the correct answer from the options given below.

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Both statement I and II are incorrect.

Statement I is correct but statement II is incorrect.

Both statement I and II are correct.

Statement I is incorrect but II is correct.

answer is C.

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Detailed Solution

Both the statements are correct.

Statement I: The reaction time of muscle fibers can indeed vary in different muscles. Different muscles can have different compositions of muscle fibre types (fast-twitch, slow-twitch, etc.), leading to variations in their response times.

Statement II: During muscle relaxation, calcium ions (Ca⁺⁺) are actively pumped back into the sarcoplasmic reticulum (sarcoplasmic cisternae). This process is essential for muscle relaxation and preventing continuous contraction.

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