0
Why don't action potentials keep going back and forth on along an axon?
Wiki User
∙ 11y agoWant this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
What is the periodic trend for electrongativity?
Electronegativity increases when going right along a period and decreases when going downwards along a group.
What happens when action potential reaches presynaptic terminal?
Action potentials propagate from an influx of Na and an efflux of K along an excitable cell (neuronal or muscular). If you think of a zipper with two heads attached to the top, as one zipper head traverses down and opens the zipper the next zipper goes down to close. The first zipper head is the action potential going down an axon. It is able to proceed because there is a membrane potential difference between outside the cell and inside the cell. A normal neuron has a membrane potential of -70mV. That means inside the cell is more negative than outside the cell. So when an action potential is elicited, Na rushes in and K rushes out. This produces slight changes in the membrane potential causing it to go up to around +35mV (inside cell). As this happens right next to that Na and K channels are more Na and K channels that see this happening and they open up in response. This occurs like the first zipper head going down. The second zipper going down is the efflux of Na and influx of K to restore the membrane potential back to normal. When the action potential reaches the end, called terminal bouton, calcium channels that are there waiting for this action potential open up and allow a rush of calcium into the terminal bouton. The calcium serves a separate function to push out little vesicles called neurotransmitters out of the cell to continue an action potential into a different cell.
What does si andele andele?
ándale is an expression used specifically in Mexico. It means hurry or move along, get going... anything along those lines.
How do you bang yourself?
you take your clothes off. then put your penius in the hole...and start going back and forth... you take your clothes off. then put your penius in the hole...and start going back and forth...
The red sea was formed along what boundary?
Divergent boundaries because the plates are going away from one another.
Why are action potentials usually conducted in only one direction?
By only being conducted in one direction, action potentials allow for fast, direct communication between brain and the peripheral tissues. A good analogy for the one-way function of action potentials is the idea of a one way street. When a car drives the wrong way on a one-way street, the normal drivers are confused, and things can go wrong very easily. For a physiological answer to your question, the ion channels in the axon behind an action potential that just passed have become hyperpolarized compared to their resting state. This means they are not as sensitive as normal to any given electrical impulse (ie. action potential). Because of this, the action potential won't go back towards the direction it came from, because the channels that would have to be opened to allow this are very hard (temporarily) to re-open. The electrical energy of the impulse will favor going in the forward direction instead of going back, because going forward it does not have to overcome such hyperpolarized ion channels, and instead can move forward with relatively little resistance.
What is the complication for Rodrick rules?
Greg, most of the time, doesn't get along well at all with his brother, and they have a series of dramatic events constantly going back and forth between them
Is there going to be a forth season of glee?
yes
Is there going to be a forth warriors series?
Yes
Is there going to be a forth book in the hex hall series?
Unfortunately, I have been hearing no, that she is going to write a spin off book series instead. Though, I do wish she were going to write a forth book.
Is there going to be a forth series of horrible histories?
yes
Is there going to be a fourth sequel to airhead?
There is not going to be a forth book in the airhead series it was the Airhead triology.
Is there going to be a forth book to ' his dark materials ' by Phillip Pullman?
No
Is there going to be a Legend of Zelda movie coming out soon?
apparently, no. happy forth of July apparently, no. happy forth of July
What is earth's electric potential?
earth cant have a lot of potentials a it is a planet but the more electric that we use the faster we are going to run out of the energy source then what would you do
Which film will they do next in Narnia?
for the forth movie they are going to do the magicans nethpew
Is Orlando Bloom going to be in the forth 'Pirates of the Caribbean' movie?
Yes, he will be
