BIO 161 Lecture Notes - Lecture 21: Maltase, Lactase, Sucrase
Document Summary
Esophagus is where peristalsis helps move the bolus to the stomach. Storage of food: slows the entry into the small intestine because digestion is a slow process and the intestines can be overloaded. +digestion can take between two to six hours. Liquefaction of food: transforms the bolus into chyme (liquid) Chemical digestion of food: stomach secretes hydrocholirc acid (hcl), pepsin (enzyme) mucus. Hydrocholoric acid (hcl) destroy pathogens, denatures proteinis which is essentially unfolding the prtoeins, activates pesin by coverting pepsinogen into pepsin. Mucus protecs the cells of the stomach from hydrocholoric acid. Ulcers: occur when hydrocholoric acid is destroying the stomach and intestinal cells. Can be caused by a decrease in mucus or increases in hydrocholoric acid. Most ulcers are caused by a particular strain of bacteria that exists in the body. Small intestine is where the rest of the digestion and nutrient absorption occurs. Accessor organs for the small intestine: pancreas, liver, gall bladder.
