Assertion: In a myelinated nerve fibre the impulse jumps from one node of Ranvier to the other.

step 1 So before knowing to the answer we are having the two statement that is given in the Assertion a

Assertion: In a myelinated nerve fibre the impulse jumps...

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Key Concepts

Ion Exchange

Ion exchange in the context of nerve conduction refers to the movement of ions across the neuronal membrane at the nodes of Ranvier. This ion movement, primarily involving sodium and potassium ions through voltage-gated channels, is essential for the generation and propagation of action potentials along the axon.

Myelin Sheath

The myelin sheath is an insulating layer that surrounds the axon of many neurons. It is produced by specialized glial cells and serves to increase the speed and efficiency of electrical signal transmission along the nerve fiber by preventing ion leakage.

Nodes of Ranvier

Nodes of Ranvier are the regularly spaced gaps in the myelin sheath along an axon. They are crucial sites where the axonal membrane is exposed, allowing for the exchange of ions necessary for regenerating and propagating the action potential.

Saltatory Conduction

Saltatory conduction is the process by which an electrical impulse jumps from one node of Ranvier to the next along a myelinated nerve fiber. This mode of conduction significantly enhances the speed of signal transmission compared to continuous conduction along unmyelinated fibers.

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