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The main ions found inside a neuron are potassium and organic anions. The organic anions cannot cross the cell membrane but potassium ions can. It is the diffusion of potassium ions out of the cell which is the main cause of the resting membrane potential.
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What type of ion channels does an actions potential in the axon terminal of a motor neuron open?
voltage-gated calcium ion channel
When the outside of the neuron cell is more positive than the inside the cell is?
polarized peace.love.hippiness
When the outside of the neuron cell is more positive than the inside the cell is .?
polarized peace.love.hippiness
How does a neuron create a positive feedback loop?
through what can be seen as the domino effect. when depolarization opens sodium ion channel and that results to the opening of more sodium ion channels. this creates a positive feedback loop.
In a neuron where are voltage-gated calcium channels located?
Found in the terminal
What is the chief positive intracellular ion in a resting neuron?
The chief positive intracellular ion in a resting neuron is a potassium ion. Just inside the cell of a resting neuron, the membrane is negative.
Which describes the ion concentrations inside and outside of a neuron?
The sodium ion concentration is higher on the outside of the cell and potassium ion concentration is higher on the inside of the cell
What condition is neuron in when the outside of the neuron has a net positive charge and the inside has net negative charge?
This is called the resting potential (inactive state) of the neuron. However, when a neurotransmitter binds to receptors, electrical stimulus is applied, etc. to induce an opening of ion channels in the membrane of the neuron, positive ions rush into the neuron from the outside to the inside, and result in a sharp increase of the positive charge density (due to more positive ions) inside the neuron. Beyond a certain threshold, this can induce the creation of an action potential, causing the neuron to fire. After the action potential is created, and the neuron fires, there is a short refractory period where the neuron cannot be fired again due to stimuli, when positive ions are pumped back out of the neuron, negative ions are brought into the neuron, and then the ion channels close, leaving the neuron in a polarized state, and returning it to a resting potential.
What region of a neuron would have significant numbers of voltage-gated ion channels?
These are found along the axon and at the synapse. Voltage-gated ion channels directionally propagate electrical signals in one direction.
What is the main intracellular ion in a resting neuron?
potassium ions
Is motor a neuron?
motor neuron is a type of neuron that found at the muscles, tissues, and organs.
What ion causes re polarization of the neuron during an action potential?
K+
What causes the vesicles inside a neuron to fuse with the plasma membrane?
An action potential in the neuron
A polarized neuron has fewer positive ions inside in comparison to the outside of the neuron?
True
When a neuron's resting potential is occurring the neuron is what charge on the inside?
resting potiental
What type of ion channels does an actions potential in the axon terminal of a motor neuron open?
voltage-gated calcium ion channel
What makes sure that there is one action potential in the neuromuscular junction for one action potential in the muscle?
After a neuron fires, there is a refractory period where certain factors in the neuron prevent it from being depolarized again. This is made possible by an "overshoot" of polarization (returning to a much stronger negative ion charge inside the neuron) after the action potential passes. This ensures that voltage-controlled ion channels remain closed for a small period of time and do not become overactive through continuous restimulation.
