What Is the First Event in Muscle Fiber Contraction

question 95

Multiple Choice

What is the first event in muscle fiber contraction?

• A)The muscle fiber membrane is stimulated and a muscle impulse travels deep into the fiber through transverse tubules.
• B)Acetylcholine diffuses across a gap at a neuromuscular junction.
• C)Acetylcholine is released from the end of the motor neuron.
• D)Calcium ions diffuse from sarcoplasmic reticulum into the sarcoplasm and bind to troponin molecules.

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