Question
QUESTION 35 Which of the following is NOT true regarding the propagation of action potentials O...
QUESTION 35 Which of the following is NOT true regarding the propagation of action potentials O A. All of these statements are true B. The magnitude of the action potential stays the same as it travels down the axon. C. Voltage-gated Na+ channels open only when the threshold potential is reached. OD. Each segment of the axon prevents the adjacent segments from firing, E. The refractory period allows the impulse to travel in only one direction OF. None of these statements are true
Answers
Answer: (D) Each segment of the axon prevets the adjacent segments from firing.
Depolarization spread passively from one axonal segment to another by triggering the opening of voltage-gated Na+ channels and hence another action potential propogates. Refractory period prevent generation of another action potential because that the travelling AP cannot initiate another action potential in the retrograde direction since the anterograde terminal only have excitable region.
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