The period in which an axon membrane cannot generate an action potential is called __________.

• A. saltatory conduction
• B. depolarization
• C. a resting potential
• D. an action potential
• E. the refractory period

Answer: (E)

Verified step by step guidance

1. Understand the concept of an action potential: An action potential is a rapid rise and subsequent fall in voltage or membrane potential across a cellular membrane, typically observed in neurons.
2. Learn about the refractory period: The refractory period is a phase during which a neuron is unable to fire another action potential. This occurs immediately after an action potential and ensures that the signal travels in one direction along the axon.
3. Differentiate between absolute and relative refractory periods: The absolute refractory period is when no new action potential can be initiated, regardless of the strength of the stimulus. The relative refractory period follows, where a stronger-than-normal stimulus is required to initiate an action potential.
4. Recognize the importance of the refractory period: It prevents the backward propagation of the action potential and ensures the unidirectional flow of nerve impulses.
5. Relate the refractory period to the options given: Saltatory conduction refers to the jumping of action potentials between nodes of Ranvier in myelinated axons, depolarization is the initial phase of an action potential, a resting potential is the baseline membrane potential, and an action potential is the event itself. The refractory period is the correct term for the phase when the axon cannot generate another action potential.