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Q.

Which of the following events occur  during muscle contraction?
(A) Length of sarcomere increases 
(B) Myosin cross bridges pull the thin filaments into H-zone 
(C) I-band reduces or disappears 
(D) Active sites are masked by troponin and tropomyosin complex
(E) Z-lines attachéd to actins are pulled outwards 
Choose correct answer from the options given below

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a

A, B, C, D 

b

B, C, D, E 

c

B, C only 

d

A, C, D only 

answer is C.

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Detailed Solution

Length of sarcomere decreases during contraction.  Z-lines are pulled inwards (i.e. towards H zone). Active sites are unmasked.

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