How action potential is generated along a myelinated neurone?

Answer 1

By voltage fluctuations associated with dendrosomatic synaptic activity.

(I'm not sure if this answer is correct)

Here's the correct answer in better detail:

a. Generation of an action potential involves a transient increase in Na+ permeability, followed by restoration of Na+ impermeability, and then a short-lived increase in K+ permeability.

b. Propagation, or transmission, of an action potential occurs as the local currents of an area undergoing depolarization cause depolarization of the forward adjacent area.

Answer 2

The potential is generated like usually at the axona hillock, just as with any other neuron.

Look up saltatory conduction to understand how it is propigated in a myelinated neuron.  First you need to understand that a myelinated neuron is not covered with meylin along the hole length of the axon.  Myelin exists as a covering in sections, looking something like sausage links strung up together.  The spaces between the myelin covering are called the nodes of Ranvier.  Saltatory conduction is the process by which an action potential "jumps" from one node to the next, speeding up the conducting process.

Answer 3

Neurons, or nerve cells, are stimulated when the polarity across their plasma membrane changes. The polarity change, called an action potential, travels along the neuron until it reaches the end of the neuron.

An action potential is capable of traveling long distances. If a depolarizing graded potential is sufficiently large, Na+ channels in the trigger zone open. In response, Na+ on the outside of the membrane becomes depolarized . If the stimulus is strong enough additional Na+ gates open, increasing the flow of Na+ even more, causing an action potential, or complete depolarization (from -70 to about +30 millivolts).

This, in turn, stimulates neighboring Na+ gates, farther down the axon, to open. In this manner, the action potential travels down the length of the axon as opened Na+ gates stimulate neighboring Na+ gates to open. The action potential is an all-or-nothing event.

When the stimulus fails to produce depolarization that exceeds the threshold value, no action potential results, but when threshold potential is exceeded, complete depolarization occurs.

Answer 4

Action potentials are generated along myelinated neurons through a process called saltatory conduction. In myelinated neurons, action potentials "jump" between the nodes of Ranvier, where the myelin sheath is absent. This allows for faster propagation of the action potential along the neuron compared to unmyelinated neurons. Myelin helps to insulate the neuron and speeds up the transmission of electrical signals.

Answer 5

The action potentials are generated and transmitted along the nerve cell as a result of the stimulus produced.