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.
If that black spot on your lower lip is scaring you, a dermatologist explains four possible causes including cancer. Keep in mind that what appears to be black may actually be a deep dark purple, or, if the speck is small enough, you may notice upon very close inspection that itâs actually medium brown.