The First Event in Muscle Fiber Contraction Is That

question 39

Multiple Choice

The first event in muscle fiber contraction is that

• 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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