In summary, your stomach breaks your food into smaller pieces and mixes it with all of the above secretions in mechanical digestion. Parietal cells secrete hydrochloric acid and intrinsic factor. Chief cells secrete pepsinogen, chymosin and gastric lipase.
IM 14 And have been biting the insides of my cheeks and lip for years now. Itâs a habit that I just canât break. Iâve been told that sense I have ADHD its a reason that I do it, but Iâm not sure if thatâs true.
1 Mucoceles may also be found on the inner side of the lower lip.  Causes. A bump inside your mouth may be caused by burning after drinking or eating something that was too hot. Bumps inside the mouth may also be due to irritation caused by eating overly spicy, salty or sour foods.