Which of the following is correct about speed of nerve impulse:
Correct answer: A. Thicker the nerve fiber-less resistance to flow of current-faster the nerve impulse.
- A. Thicker the nerve fiber-less resistance to flow of current-faster the nerve impulse.
- B. Thicker the nerve fiber-more resistance to flow of current-slower the nerve impulse
- C. Thinner the nerve fiber-less resistance to flow of current-slower the nerve impulse
- D. None of the above
Explanation
The correct answer is that thicker nerve fibers have less resistance to the flow of current, leading to faster nerve impulse transmission. This is primarily because thicker fibers are typically more myelinated. Myelin acts as an insulator, reducing resistance and increasing conduction speed. In contrast, thinner fibers have less myelin and more resistance, resulting in slower impulse transmission. This explains why the other options are incorrect, as they either incorrectly state the relationship between fiber thickness, resistance, and impulse speed, or deny the presence of a correct statement.
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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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