This PPT is good for about 3 hours of instruction. It covers the main organs like stomach, small and large intestine, and their functions, and the enzymes in each phase of digestion. An animation of the swallowing process is included (only in the teacher's version), as well as the function of the liver. The teacher's version is the one shown on the screen with important words highlighted but blanked out in the student's version, so students have to copy some things, which keeps them on their toes. I highly recommend getting both versions to use in tandem.