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Solution


Q.

Name the ion responsible for unmasking of active sites for myosin for cross-bridge activity during muscle contraction.             [2016]
1 Calcium    
2 Magnesium  
3 Sodium    
4 Potassium  

Ans.

(1)

Calcium ion plays an important role in muscle contraction. Calcium ions bind to troponin causing a change in its shape and position. Thus, in turn alters shape and position of tropomyosin to which troponin binds. This shift exposes the active sites on F-actin molecules. Myosin cross-bridge are then able to bind to these active sites.