Check your instructor to see if these are mandatory, or used as a review
Wait!
I'll admit it! the following video called "Receptors and Senses #1: Intro to Receptors and Receptor Potentials" is confusing and...well..not very good.
It jumps around and is difficult to follow.
I suggest that you first watch
the outline of this material.
It will put everything in order for you. Then,if you still want, you can watch:
I do not have any ANS screencasts specifically created for A&P 1 yet. However, I have a series created for General A&P that might act as a good review. Watch only if you need a review.