Question

explain the conduction of a nerve impulse along a never fibre​

Answer 1

Answer:

This is because the myelinated nerve fibre is coated with the myelin sheath. The myelin sheath is impermeable to ions. As a result, the ionic exchange and depolarization of nerve fibre are not possible along the whole length of the nerve fibre. It takes place only at some point, known as nodes of Ranvier.

Explanation:

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Answer 2

Correct question :

explain the conduction of a nerve impulse along a nerve fibre

AnSwer :

The conduction of a nerve impulse along a nerve fibre is as follows :

$\bigstar$ In a resting nerve fibre (i.e., at resting potential), the axoplasm is electronegative and the exterior (ECF) is electropositive.

$\bigstar$ This state of the resting membrane is called polarised state.

$\bigstar$ When a threshold stimulus is applied, the membrane potential undergoes a change to become action potential, where the interior or axoplasm becomes electropositive and the outside is electronegative, i.e., depolarisation. Consequent to depolarisation, cations diffuse through the cytoplasm from the electropositive depolarised part of the membrane to the elec-tronegative polarised part.

$\bigstar$ Simultaneously, cations from the polarised region diffuse through the ECF to the electronegative region on the outer side.

$\bigstar$ This flow of ions depolarises the next region of the membrane producing the action potential there.

$\bigstar$ Repetition of this process makes the action potential flow onwards as the depolarisation proceeds along the membrane.