0
No. The inside of the neuron becomes more positively charged.
The resting potential is -70 millivolts. So, the outside of the neuron starts off being more positively-charged, and the inside is more negatively-charged.
As sodium ions (which are cations - positively-charged ions) move into the neuron (via sodium ion channels), this depolarizes the neuron (induces a "signal"). If this net signal is above a certain threshold, it will trigger an action potential, whereby channels will open in the axon, just ahead of the action potential itself, which allows more cations to flow into the axon, increasing the positive charge inside the axon, and further triggering the opening of cation channels downstream.
Note: As the action potential (positively-charged region inside an axon) propagates down the axon, sodium channels open behind it to pump sodium ions back outside the axon, restoring the inner negative charge of that region, so that it can return to the resting potential. Therefore, once the action potential is formed inside the axon, and is moving downstream, sodium pumps open behind it so that the signal is dampened in an already-activated region, thereby restoring the resting potential. This prevents retriggering a secondary action potential (which would result in amplification of the end signal).
On the other hand, when an inhibitory neurotransmitter binds with the neuron, or else a chloride ion channel (chloride ions are anionic - negatively-charged) opens, chloride ions enter the neuron, which drives the membrane potential further into the negative, thereby reducing the likelihood of action potential (signal) generation.
Wiki User
∙ 11y ago
Add your answer:
Earn +20 pts
Where does an impulse move from on neuron to the other?
The impulse has to cross over a synapse to another neuron or an effector.
What are the sources of stimulation that start a nerve impulse?
An impulse begins when a neuron is stimulated by another neuron or by the environment.
What travels through the neuron?
An electrical impulse will travel through a neuron.
The message that travels through a neuron?
A neural impulse. Specifically, once it fires, an action potential.
What happens when an impulse reaches the end of an axon?
It reaches the synapse and sends neurotransmitters to start a new impulse to the next neuron
What is a neuron impulse?
it is neuron impulse
Where does an impulse move from on neuron to the other?
The impulse has to cross over a synapse to another neuron or an effector.
Why would a neuron not send an impulse?
If a neuron is not sending out an impulse or signal, this means the neuron is at rest. Neurons send signals electrochemically.
The abrupt shift in the charge of a neuron from a negative to a positive charge is known as?
It is probably called as action potential.
A neuron reaches its trigger point when?
Action potential is nerve impulse triggered when a neuron reaches its threshold, or trigger point for firing. Threshold trigger point for a neuron's firing about negative 50 millivolts.
What are the sources of stimulation that start a nerve impulse?
An impulse begins when a neuron is stimulated by another neuron or by the environment.
What travels through the neuron?
An electrical impulse will travel through a neuron.
What begins when a neuron is stimulate by another neuron in its environment?
A nerve impulse
Which type of the neuron carries the impulse to the sense organs to the brain?
sensory neuron
Why is a neuron called an interneuron?
A neuron is called a inter-neuron because that specific neuron takes impulse from one neuron to a next neuron. For example your sensory neuron sends a impulse that you had felt a hot object. It goes through the spine to a inter-neuron to a motor neuron (this processes is called a reflex). Then the motor neuron tells your muscles in your hand to move
What is a message that travels through the neuron?
An Impulse
What carries an impulse away from neuron?
The axon.
