PHYSIOLOGY
CENTRAL NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What increases impulse speeds?
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Axon
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Cell body
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Nodes
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Myelin
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Explanation:
Detailed explanation-1: -The presence of a myelin sheath increases the speed of conduction of nerve impulses. Myelinated axons conduct impulses about 10 times faster than comparable unmyelinated ones.
Detailed explanation-2: -The long, myelin-covered section of axon between nodes is the internode. The purpose of the myelin sheath is to increase the speed of transmission by acting as an electrical insulator.
Detailed explanation-3: -Nodes of Ranvier or myelin-sheath gaps along the axons that contain sodium and potassium ion channels, allowing the action potential to travel quickly down the axon by jumping from one node to the next.
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