Question

Question 2: Explain what is occurring in this graph:

+30 mv Nat Nat K+ Sodium gates dose Nat Nat Potassium gates open Depolarization Active sodium and potassium pumps. Nat Nat K Repolarization Rest -55 mv-Gate threshold -70 mv Stimulus potential Nat (1) TO Nat K+ -90 mV E Hyperpolarization

Answer 1

The picture is representing the action potential in the membrane:

First of all, the membrane is at resting stage or we can say that it is polarised having -70mV.

* Depolarisation: The voltage gated sodium channel opens. This leads to change the potential of membrane from -70 to +30 mV.

* Repolarisation: The sodium channel is closedclosed and potassium gate open. This leads to change the potential from +30 to 0.

After that the potassium channel is activated. It transports potassium ion outside the membrane.This reduces the membrane potential to the -70 mV

* Hyper polarising: The more potassiuk ion moves outside and reduces the membrane potential to the -90 mV in hyper polarising pahse.

Then again the resting potential is achieved.