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Given an idea about mechanism of muscle ...

Given an idea about mechanism of muscle contracting along with a suitable diagram.

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During muscle contraction

Cardiac muscles contract

Knowledge Check

  • When muscles contract

    A
    myosin slides past actin
    B
    calcium is taken up by calcium storage sacs
    C
    sarcomeres increase in size
    D
    H zone disappears

  • Which is true of muscle contraction?

    A
    sarcolemma becomes permeable to `Na^(+)` ions
    B
    concentration of `Ca^(2+)` ions is reduced in myoplasm
    C
    sarcolemma becomes nonpermeable to `Na^(+)` ions
    D
    sarcolemma becomes permeable to `Ca^(+)` ions

  • Muscle contraction requires

    A
    action potential
    B
    ATP
    C
    `Ca^(2+)`
    D
    all of the above

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