What Is Occurring During This Period of a Muscle Twitch

question 1

Multiple Choice

What is occurring during this period of a muscle twitch contraction?

• A) The muscle action potential sweeps along the sarcolemma and calcium ions are released from the sarcoplasmic reticulum.
• B) Crossbridge attachments form, and repetitive power strokes occur.
• C) The level of Ca²⁺ in the sarcoplasm decreases, because it is being actively transported back into the sarcoplasmic reticulum and bound to calsequestrin.
• D) The muscle fiber relaxes as myosin heads detach from the actin filaments.
• E) Acetylcholinesterase is preventing the ligand gated channels at the motor end plate from binding to ACh.

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