Saltatory conduction:
Solution
Saltatory conduction is a way in which nerve impulses are conducted in the body, specifically in myelinated nerve fibers. Here's a step-by-step explanation:
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The process begins at the axon hillock of a neuron, where an action potential (nerve impulse) is generated.
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This action potential travels along the axon, but instead of moving continuously down the axon, it jumps from one node of Ranvier to the next. These nodes are small gaps in the myelin sheath, a fatty substance that insulates the axon.
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At each node of Ranvier, the action potential is regenerated by the influx of sodium ions into the neuron. This is due to the high concentration of voltage-gated sodium channels at these nodes.
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The action potential then 'jumps' to the next node, bypassing the myelinated sections of the axon. This is the 'saltatory' (jumping) aspect of saltatory conduction.
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This process continues until the action potential reaches the end of the neuron, where it can be transmitted to the next neuron via a synapse.
Saltatory conduction is faster than continuous conduction (which occurs in unmyelinated neurons) because the action potential can skip over the myelinated sections of the axon, reducing the time it takes for the impulse to travel down the neuron.
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