EMBRYOLOGY
NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The Nodes of Ranvier exist because ____
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it speeds up the message sent along the axon
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schwann cells aren’t large enough to cover the whole axon
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the neurons get damaged and gaps form
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it’s a side effect of the way the neuron is developed
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Explanation:
Detailed explanation-1: -Increasing the number of myelin wraps lowers the capacitance along the internode, reducing the time required to charge the internodal membrane. This means that consecutive nodes of Ranvier reach threshold quicker and, therefore, the conduction velocity is increased.
Detailed explanation-2: -Nodes of Ranvier are microscopic gaps found within myelinated axons. Their function is to speed up propagation of action potentials along the axon via saltatory conduction.
Detailed explanation-3: -Nodes of Ranvier are gaps in the myelin along the axons; they 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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