During muscular contraction,which of the foll | vedclass

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Question

(A) According to the sliding filament theory of muscle contraction:$1$. The $'H'$ zone disappears as actin filaments slide over myosin filaments.$2$.

Vedclass · Accepted Answer

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

Vedclass · Answer

(A) According to the sliding filament theory of muscle contraction:$1$. The $'H'$ zone disappears as actin filaments slide over myosin filaments.$2$. The $'A'$ band (anisotropic band) retains its length because it represents the length of the myosin filaments,which do not shorten.$3$. The $'I'$ band (isotropic band) reduces in width as actin filaments are pulled towards the center of the sarcomere.$4$. Myosin heads hydrolyze $ATP$ to $ADP$ and $Pi$,providing energy for the power stroke.$5$. The $Z$-lines attached to actin filaments are pulled inwards towards the center of the sarcomere,shortening the sarcomere.Therefore,events $(a), (c), (d),$ and $(e)$ are correct.

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