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Home  >>  JEEMAIN and AIPMT  >>  Biology  >>  Human Physiology
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During contraction : 1. Actin filaments are pulled towards the centre of ‘A’ band. The ‘Z’ line attached to these actins are also pulled inwards thereby causing a shortening of the sarcomere. 2. ‘I’ bands get reduced, whereas the ‘A’ bands retain the length Regarding 1 and 2 : What are A,B and C in order?

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( a ) 1 is correct but 2 is incorrect; Relaxed state, Contracting and Maximally contracted state
( b ) Both are correct; Relaxed state, Contracting and Maximally contracted state
( c ) 1 is incorrect but 2 is correct; Relaxed state, Maximally contracted and Contracting state
( d ) Both are incorrect; Maximally contracted state, Contracting and Relaxed state
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1 Answer

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(B) is the right answer.

During contraction : Actin filaments are pulled towards the centre of ‘A’ band. The ‘Z’ line attached to these actins are also pulled inwards thereby causing a shortening of the sarcomere. ‘I’ bands get reduced, whereas the ‘A’ bands retain the length
answered Mar 26, 2014 by pady_1
 

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