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Home  >>  JEEMAIN and AIPMT  >>  Biology  >>  Human Physiology
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In the centre of each ___________ (C) is an elastic fibre called ________ (A) which bisects it. The thin filaments are firmly attached to the _________ (A). The thick filaments in the ________ (B) are also held together in the middle of this band by a thin fibrous membrane called ___________ . The ______ (B) and _______ (C) are arranged alternately throughout the length of the myofibrils.

image
( a ) ‘I’ band, ‘Z’ line; ‘Z’ line ; ‘A’ band , ‘H’ zone; ‘A’ band and ‘I’ band
( b ) ‘I’ band, ‘Z’ line; ‘Z’ line ; ‘A’ band , ‘M’ line; ‘A’ band and ‘I’ band
( c ) ‘A’ band, ‘Z’ line; ‘Z’ line ; ‘I’ band , ‘M’ line; ‘I’ band and ‘A’ band
( d ) ‘A’ band, ‘Z’ line; ‘Z’ line ; ‘I’ band , ‘H’ zone; ‘I’ band and ‘A’ band
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(B) is the right answer.

In the centre of each ‘I’ band is an elastic fibre called ‘Z’ line which bisects it. The thin filaments are firmly attached to the ‘Z’ line. The thick filaments in the ‘A’ band are also held together in the middle of this band by a thin fibrous membrane called ‘M’ line. The ‘A’ and ‘I’ bands are arranged alternately throughout the length of the myofibrils.
answered Mar 26, 2014 by pady_1
 

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