Structures of Digestive System con't
- Cardiac Sphincter (esophageal sphincter) - Band of muscle which closes off the top part of the stomach to prevent food from being regurgitate into the esophagous.
- Stomach - J-shaped organ which stores and churns food. The churning helps physically digest food, which creates more surface area and results in a mushy liquid called acid chyme. The chemical digestion of proteins beings here.CONTROL OF GASTRIC (STOMACH) SECRETIONS:(Especially after eating a protein-rich meal)Gastrin - Is a hormone produced by the lower part of the stomach which enters the blood stream and later stimulate the upper part of the stomach to stimulate gastric glands to produce Pepsinogen and HCl. HCl and pepsinogen react with each other to produce Pepsin.
Pepsin chemically digests proteins to peptides.
HCL can burn the gut lining so a mucous layer is produced to prevent this from happening. If a portion of the gut is burned it is called an ulcer.