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Assertion (A) : Impulses are faster in myelinated nerves than unmyelinated ones.

Reason (R) : The impulse must travel the length of the myelinated neuron. 

Option: 1

Both A and R are true and R is the correct explanation of A.
 


Option: 2

Both A and R are true but R is NOT the correct explanation of A.


Option: 3

A is true but R is false.

 


Option: 4

A is false but R is true.


Answers (1)

best_answer

Myelin accelerates action potential conduction by functioning as an electrical insulator. Unmyelinated axon conduction velocities, for example, range from around 0.5 to 10 m/s, but myelinated axons can conduct at speeds of up to 150 m/s. Hence assertion is true.

The nerve impulse jumps from one Ranvier node to the next in myelinated fibres. As a result, it is speedier. However, the impulse must travel the entire length of the non-myelinated fibre. As a result, it moves slowly. Hence reason is false. Therefore option C is correct.

As reason is false, option A and B are incorrect.

As assertion is true, option D is incorrect.

Hence, Option c is the correct answer. 

Posted by

himanshu.meshram

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