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NEET BIOLOGYMedium

During muscular contraction, which of the following events occur? (a) 'H' zone disappears (b) 'A' band widens (c) 'I' band reduces in width (d) Myosin hydrolyzes ATP, releasing the ADP and Pi (e) Z-lines attached to actins are pulled inwards

A

(b), (c), (d) and (e) only

B

(b), (d), (e) and (a) only

C

(a), (c), (d) and (e) only

D

(a), (b), (c) and (d) only

Step-by-Step Solution

According to the sliding filament theory described in the text:

  1. The 'Z' lines attached to actin are pulled inwards (e) .
  2. The 'I' bands get reduced in width (c) .
  3. The 'A' bands retain their length; they do not widen (b is incorrect) .
  4. Myosin hydrolyses ATP, releasing ADP and Pi (d) .
  5. As thin filaments slide over thick filaments, the 'H' zone disappears (a) .
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