NEET PG DENTAL EXAM

HISTOLOGY

NERVOUS TISSUE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
As axon diameter increases, propagation speed:
A
Increases
B
Decreases
C
Stays the same
D
None of the above
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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