Which of the Following Statements Is TRUE Regarding Skeletal Muscle

question 91

Multiple Choice

Which of the following statements is TRUE regarding skeletal muscle contraction?

• A) During the excitation phase, Ca²⁺ enters the motor neuron through chemically gated channels and causes exocytosis of acetylcholine into the synaptic cleft.
• B) An action potential is generated and propagated along the sarcolemma due to K⁺ influx through voltage gated channels.
• C) The myosin head binds to the actin receptor region once it has hydrolyzed ATP and the regulatory proteins (Troponin and tropomyosin) have been "pulled out of the way."
• D) The powerstroke occurs immediately after the myosin head has hydrolyzed the ATP molecule.
• E) ATP is necessary for coupling to occur, however, Ca²⁺ is only used during maximal force contractions.

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