Physiology 1021 Lecture Notes - Tripeptide, Protein Catabolism, Ileum

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Describe the four processes of the digestive system a. Coordinate contraction/relaxation a long the gastrointestinal tract d. Endocrine (secrete into the blood) secretion- blood vessels. Positively regulated by both parasympathetic (psns) and sympathetic (sns) pathways. Can"t initiate salvation, can potentiate effects of psns. List and describe the 3 stages of swallowing a. b. c. Voluntary stage- movement of the bolus to the oropharynx. Esophageal stage- involuntary passage of the bolus into the stomach. List and describe the layers of the stomach a. Alcohol can be absorbed in the stomach b. Explain the different functions of acid in the stomach a. Pepsinogen (secreted by chief cells) produces pepsin when in contact with acid. Pepsin begins protein digestion in the stomach c. Inactivated by the ph change (hcl) d. e. f. G cells release gastrin (gastric motility and function) List and describe the function of exocrine secretions of the pancreas a. b. c. Procarboxypeptidase is inactive, cleaved by trypsin forming carboxypeptidase.

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