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Biology · PYQ NEET UG 2018

हिन्दी

Calcium is important in skeletal muscle contraction because it

  1. detaches the myosin head from the actin filament.
  2. activates the myosin ATPase by binding to it.
  3. binds to troponin to remove the masking of active sites on actin for myosin.
  4. prevents the formation of bonds between the myosin cross bridges and the actin filament.

Correct answer · Option 3

binds to troponin to remove the masking of active sites on actin for myosin.

Explanation

Calcium ions bind to troponin on actin filaments, exposing the active binding sites for myosin heads, enabling cross-bridge formation.
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