For anyone who don't understand why the membrane is negative, it's because there are large-sized negative ions(such as some proteins) inside the cell that cannot move out. They've got so many charges that we need both potassium and sodium to make it positive.
Great video, TP. For some reason, I always thought there was one pump that did all the sodium, potassium movements. But seeing how there are three unique pumps makes me understand the APs better
ive been studying this subtopic for two days and still couldn't understand it until i found this video and it took me only 5 MINUTES ! to understand it, thank you
Thank you so much!! I have been reading for hours and your video explained it so well in about 5 minutes. Thank you! You have saved me so much additional study time. 😊
Our profesor has been explaining this all the week but no one understood anything. Watching this tutorial, i perfectly understand in only 3 minutes. Now, action potential homework it s easy.
The best explanation of this I've seen. I understand! If I may make a suggestion: Would adding related tags, such as ATP, Sodium, Potassium to these videos make them more searchable? Because in the past I've searched for how ATP and Na/K work, and this would have been instant clarity. I only ran into this because I heard another youtuber call this an 'action potential'.
Oh God, i can't thank you enough, how helpful this video is . It took me 2 days to understand this concept , and finally you made it understandable in just 5 minutes. ❣❣❣❣❣❣
Nicely presented, but with an important mistake. The Na+/K+ pump is not the basis of the refractory period, and there is no need for the pump to restore ion concentration gradients between action potentials. So little Na+ and K+ cross the membrane during a single action potential that the concentration gradients are barely affected. The Na+/K+ pump is needed over the long term to maintain concentration gradients because of the movements of Na+ and K+ over many action potentials, as well as the steady leakage of Na+ in and K+ out even when the cell is at rest.
hi this was so useful to watch thank u!! i just have a q abt the relative proportions of charges in the short bit after hyperpolarisation? u said the Na/K pump will bring it back to resting mem potential. if the Na/K pump is transporting net 1 positive ion out, so the inside goes from negative to even more negative, why isnt it hyperpolarising further away from resting mem potential?
