Question

The post action potential hyperpolarization is caused by

Select one:

a. none of these are correct

b. entry of too much K+ into the cell

c. entry of Cl- into the cell

d. exit of too little Na+ from the cell

e. entry of too much Na+ into the cellentry of too much Na+ into the cell

Answer 1

Option B , entry of Cl- inside of cell.

Hyper polarization is the opposite of a depolarization. It increasing the stimulus required to move the membrane potential to the action potential threshold thus inhibits action potential. Mostalu it is caused by efflux of K+ (a cation) through K+ channels, or making more entry of Cl– (an anion) through Cl– channels. These two prices increase the Resting membrane potential ( example- 65 to - 80 mv) thus increase the amount of stimulus required to act as threshold stimulus.  

answered by: anonymous