In the past, anatomy students used multiple Skitch images for annotating the flow of blood through the heart. This required students to transfer all of the individual images to one per Google Slide.
This year, we decided to use Explain Everything and only the image annotation. No audio involved. Exporting the creation using the PDF to iBooks and Google Drive allows for the teacher to receive a "slide show" as is shown at the end of the the video presentation below.