Membrane Physiology is a really interesting as well as complicated so I would advise you to take time in understanding this. There are many sub-sections take 2-3 weeks. work on this because you will be using this concept in physiology as well as other subjects.
1. Transport of Substances Through Cell Membranes
We are studying this topic from ages. So only a review video is enough for this topic. After watching the video just read from the book.
2. Action Potentials
This is the main topic of this unit. There are many lectures for this on the web but I am going to share with you the ones I found to be best.
The 1st video is not of high resolution but this is the best lecture of this topic I could find.
The second one is by Dr. Najeeb.
Watch any one of the two.
3. Neuromuscular Junction
This is also a very important part of Physiology. Here are two great lectures. You can watch any one of them.
4. Muscle Metabolism and Mechanics
The first video is very helpful for understanding metabolism and the second one will clear your concepts about Muscle Mechanics.
5. Special mention
This is a playlist by Ninja Nerd Science on Musculoskeleton system. You can watch the whole playlist if you feel week in the concepts.