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4 May, 08:18

The command to contract is distributed throughout a muscle fiber by the

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  1. 4 May, 09:00
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    The correct answer will be - Transverse tubules

    Explanation:

    Transverse tubules are the tubular structure formed by the extension of the plasma membrane which innervates the cardiac and skeletal muscle cells. The T-tubules structure is structured between 20-40 nm and located at the junction of the I and A band.

    The signals from the motor neurons once raches the motor endplate in muscles are carried into the muscles by these T-tubules which transmits the signals to muscle cells at very high speed. The T-tubules cause the release of the Calcium ions from the sarcoplasmic reticulum that cause contraction of the skeletal muscle.

    Thus, Transverse tubules are the correct answer.
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