Choose the correct statements regarding muscl | vedclass

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(D) The correct statements are $A, B, D,$ and $E$.Statement $A$ is correct: $A$ motor neuron transmits a signal from the $CNS$ to the sarcolemma.State

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$(4)$ $A$, $B$, $D$ and $E$ only

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(D) The correct statements are $A, B, D,$ and $E$.Statement $A$ is correct: $A$ motor neuron transmits a signal from the $CNS$ to the sarcolemma.Statement $B$ is correct: The neural signal triggers an action potential, leading to the release of $Ca^{++}$ ions into the sarcoplasm.Statement $C$ is incorrect: $Ca^{++}$ binds to troponin on the actin filament, which exposes the active sites on actin, thereby facilitating (not inactivating) the formation of cross-bridges.Statement $D$ is correct: The exposed active sites on actin bind to the myosin head to form a cross-bridge.Statement $E$ is correct: The myosin heads pull the actin filaments towards the center of the '$A$' band, causing the sarcomere to shorten.Therefore, the correct sequence of events leads to the conclusion that $A, B, D,$ and $E$ are correct.

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$A$: Application of stimuli repeatedly just at the start of relaxation of a muscle fibre shows an increase in the extent of contraction initially and results in treppe or staircase phenomenon.
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