Maximum speed of nerve impulse transmission is____________?
Correct answer: C. 120m/sec
- A. 100 m/sec
- B. 110 m/sec
- C. 120m/sec
- D. 130 m/sec.
Explanation
The fastest impulses in heavily myelinated neurons travel at about 120 m/sec, or 120 metres per second, because myelin allows saltatory conduction between nodes of Ranvier. Students may choose 100 m/sec because it is a commonly quoted approximate speed, but it is not the maximum value used here.
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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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