Electron microscopic studies of the sarcomere | vedclass

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(B) According to the sliding filament theory,during muscle contraction,the thin filaments slide over the thick filaments.$1$. The $A$-band (containing

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The width of the $H$-zone becomes smaller

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(B) According to the sliding filament theory,during muscle contraction,the thin filaments slide over the thick filaments.$1$. The $A$-band (containing myosin) maintains its length because the thick filaments do not change size.$2$. The $I$-band (containing actin) shortens as the filaments overlap more.$3$. The $H$-zone (the central part of the $A$-band where only myosin is present) narrows or disappears as actin filaments move into it.$4$. Therefore,both statements $A$ and $B$ are technically correct observations of muscle contraction. However,in most standard competitive biology contexts,the reduction of the $H$-zone is a primary characteristic feature of the sliding mechanism.

Electron microscopic studies of the sarcomeres have revealed that during muscle contraction:

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