Action potential info leading up Flashcards
What is a stimulus
something that causes a change
Depolorization
when membrane potential becomes more POSTIVE.
due to a influx of postive sodium ions which causes membrane to become less negative and go to +30 mv
Repolorization
when membrane potential becomes more NEGATIVE.
happens when sodium chanels close and potassium channels open, causes K+ ions to rush out
Hyperpolorization
When membrane potential thats negative becomes even more negative.
caused by too many K+ ions leaving at one time
-70 to -80/-90
Refactory and the two types
when membrane can not respond normally to further stimulation. membrane can’t ve further stimulated
Absolute: No matter what stimulus is applied to the neuron, no further stimulation is possible
Realative: a large amount of stimulation will cause a stimulus to occur
at resting state, what chanels are closed?
voltage gated membrane chanels are closed at resting state
what happens during stimulation phase?
sodium is allowed to come into the cell, making voltage more postitive
Describe Graded Potential:
-when there is a small amount of change in membrane potential.
-local change in membrane
-involves the opening of SOME Na+ channels but no K+ channels
if threshold isnt met at Graded potential, what restores it back to RMP?
leak and NA+ K+ ATPase pump
everey ____ started with _______, but not every ______ becomes an _____.
every ACTION POTENTIAL started with a GRADED POTENTIAL, but not every GRADED POTENTIAL becomes an ACTION POTENTIAL
What is the threshold that must be met for an action potential to be met?
-60 mv
Can Leak channels help restore RMP after an AP?
Yes a leak channel helps restore RMP after an AP.
*note that leak channles do not help restoring RMP at rest though
