試題詳解

6. Which of the following statements regarding skeletal muscle contraction is NOT true?
(A) All neuromuscular junctions are excitatory.
(B) Multiple action potentials in the motor neuron may cause a sustained contraction.
(C) During every muscle contraction, muscle fibers change length.
(D) Every action potential in a motor neuron normally produces an action potential in the postsynaptic muscle cell membrane.