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.

Similar Questions

Arrange the following steps of muscle relaxation in the correct chronological sequence:
$I.$ $Ca^{2+}$ ions are pumped back to the sarcoplasmic reticulum.
$II.$ $Z$-lines return to their original position.
$III.$ Masking of actin filaments occurs.
$IV.$ Relaxation of muscles.

Which one of the following events is thought to be most closely related to the sliding process between the two types of filaments which bring about contraction of the fibril?

Cardiac muscles are functionally similar to which of the following?

In the myofibrils of muscle fibre:

Sarcomere is the functional unit of contraction in a muscle fibre. Identify the portion of myofibril that constitutes a sarcomere.

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