Increasing the rate of an impulse is the function of the myelin sheath. Thus, the correct option is A.
What is Impulse?
The Impulse may be characterized as an electrical signal that can be transmitted along a nerve fiber in response to an external or internal stimulus.
The Myelin sheath increases the rate of nerve impulses. This is because it insulates the part of axons and reduces the chances of any disturbance in between due to the assemblage of voltage-gated sodium channels.
Therefore, increasing the rate of an impulse is the function of the myelin sheath. Thus, the correct option is A.
To learn more about Myelin sheath, refer to the link:
https://brainly.com/question/690266
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