What Is Occurring During This Period of a Muscle Twitch

question 88

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) Ach binds to the ligand gated channels at the motor end plates.
• C) The level of Ca²⁺ in the sarcoplasm decreases, because it is being actively transported back into the sarcoplasmic reticulum.
• D) Calcium ions bind to Troponin.
• E) Power strokes generate contractile force.

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