Biology NEET Previous Year Question Paper NEET 2018 Previous Year Question Paper Single Correct MCQ
Published on: August 21, 2026

Calcium is important in skeletal muscle contraction because it

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

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The sarcoplasmic reticulum releases calcium ions into the muscle interior where they bind to troponin, thus causing tropomyosin to shift from the face of the actin filament to which myosin heads need to bind to produce contraction.

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