I use Crash Course Anatomy videos quite often in my Anat and Phys class. This is my set of write-a-longs, or WALs as I call them, for their videos on Vision and Hearing (two separate videos, but both are on one worksheet).
My WAL is broken into the sections shown within the videos and are mainly fill-in-the-blank with a couple longer write-out-the-answer questions. You may want to assign the two at separate times, as the two videos combined add up to about 20 minutes (and I always advise students to double the length of the video to estimate how much time it will get done, due to pausing/playing/thinking).
Please note that there is no key included with this product. It's good for you to watch the video so you know what your students will see, anyway :)