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1 mark

Calcium is important in skeletal muscle contraction because it:

  1. A
    Detaches the myosin head from the actin filament.
  2. B
    Activates the myosin by binding to it.
  3. C
    Binds to troponin to remove the masking of active sites on actin for myosin.
  4. D
    Prevents the formation of bonds between the myosin cross bridges and the actin filament.

Solution & Step-by-step Explanation

In a relaxed muscle, the binding sites on actin are masked by a protein complex (troponin-tropomyosin). When is released, it binds to troponin, causing a conformational change that unmasks the active sites on the actin filament, allowing myosin heads to bind and form cross-bridges.

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Calcium is important in skeletal muscle contraction because it:
A
Detaches the myosin head from the actin filament.
B
Activates the myosin by binding to it.
C
Binds to troponin to remove the masking of active sites on actin for myosin.
D
Prevents the formation of bonds between the myosin cross bridges and the actin filament.

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Locomotion and MovementMuscle Contraction

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