Practice question · Select all that apply
Select every statement that is TRUE about neurons and action potentials.
Hints
- Two options are misconceptions - one about spike size, one about the resting value.
- Spikes are all-or-none (fixed size), and rest is about -70 mV, not +40.
Show the answer
- C. The nodes of Ranvier in the myelin sheath let the signal leap forward faster.
- D. After firing, a refractory period must pass before the neuron can fire again.
- E. Dendrites receive signals while the axon carries them away.
Why
Dendrites-in/axon-out, faster leaping via the nodes, and the refractory period are all true. A stronger stimulus does not enlarge the spike (all-or-none), and the resting potential is about -70 mV, so those two are false.
Practise The Neuron and Action Potentials
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