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STD 11 - 17. Locomotion and movement — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 17. Locomotion and movement1 Mark
MCQ
In striated muscle contraction
  • A
    $H - $ band is lengthened
  • ✓
    $H-$ band is obliterated
  • C
    $A - $ band decreases in length
  • D
    $Z - $ line moves away from $A - $ band
✓

Answer

Correct option: B.
$H-$ band is obliterated
b
(b) During isotonic contraction the length of the sarcomere is reduced by the sliding of actin fibres towards the centre of myosin filament, hence  $'H'$ zone disappears.

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