Locomotion and Movement Question 1
1. Calcium is important in skeletal muscle contraction because it
[2018]
(a) Binds to troponin to remove the masking of active sites on actin for myosin.
(b) Activates the myosin ATPase by binding to it.
(c) Prevents the formation of bonds between the myosin cross bridges and the actin filament.
(d) Detaches the myosin head from the actin filament.
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Answer : a
Hints & Solutions
(a) The sarcoplasmic reticulum to release 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.
