Digital Interactive Content Human Body Systems The saliva Observe the many different roles the saliva in our mouth play! Stomach ulcers You may have heard of someone suffering from stomach ulcers or gastric. Find out just how stomach ulcers and gastric arise in our digestive system! Why we fart Have you ever wondered why we pass gas? It all begins in our digestive system! Diarrhea and heart burn When parts of our digestive system do not function as they should, we suffer from illnesses such as diarrhea and heart burn. https://videos.files.wordpress.com/8x65nKpz/what-causes-diarrhea-heart-burn_mp4_hd.mp4