When you search Google images, you can limit your search to noncommercial reuse, meaning that you should be able to use the images for noncommercial purposes.
How to limit your search:
Highly-accurate, visual databases that include thousands of models you can rotate, zoom, and dissect, and physiology and pathology animations that quickly communicate complex biology.
Find online streaming video in UC Library Search by clicking on "Advanced Search", entering your search terms, and limiting to "Online" and "Videos" (under "Resource Type"). CalNet authentication or UCB IP address often required for library-hosted materials.