The Amazing Digestive Journey is a nice iOS app for Health/Science teachers wanting to introduce the concept of digestion to students. This interactive app lets students complete activities that start in the mouth while they try to help cure a patient of their ailments. This app focuses on the different aspects of digestion through organs such as: esophagus, stomach, liver etc as well as different enzymes.
I highly recommend checking out The Amazing Digestive Journey by clicking here!!!