Action potentials are conducted in one direction because
Correct answer: B. Of the refractory period
- A. The axon is myelinated
- B. Of the refractory period
- C. Of the all-or-none law
- D. Sodium channels are everywhere
Explanation
The refractory period (when Na+ channels are inactivated) prevents backward conduction, ensuring unidirectional propagation.
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About Neurons and Nerve Impulse
Neurons receive and transmit information through dendrites, the cell body and axons. The topic explains resting potential, depolarization, repolarization, refractory periods and saltatory conduction, followed by synaptic transmission through neurotransmitters. An action potential is distinct from the graded potential produced at a receptor.
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