HISTOLOGY
NERVOUS TISSUE
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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As axon diameter increases, propagation speed:
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Increases
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Decreases
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Stays the same
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None of the above
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Explanation:
Detailed explanation-1: -Larger diameter axons have a higher conduction velocity, which means they are able to send signals faster. This is because there is less resistance facing the ion flow.
Detailed explanation-2: -By acting as an electrical insulator, myelin greatly speeds up action potential conduction (Figure 3.14). For example, whereas unmyelinated axon conduction velocities range from about 0.5 to 10 m/s, myelinated axons can conduct at velocities up to 150 m/s.
Detailed explanation-3: -Axon diameter, internode distance, and myelin sheath thickness all influence the speed of action potential propagation. Moreover, these factors are to a certain degree correlated with each other.
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