BIOLOGY 225 Lecture Notes - Lecture 29: G Cell, Cholesterol, Lecithin

• School: U of M
• Department: Biology
• Course: BIOLOGY 225
• Professor: Xu Haoxing

Document Summary

An adequate diet must supply chem energy for cell processes, organic molecules as building blocks for macromolecules, and essential nutrients. The submucosa layer of the intestinal wall is primarily composed of connective tissue. The chief cells of the gastric pits of the stomach secrete pepsinogen. Calcium is primarily absorbed in the large intestine. Vitamins and minerals typically absorbed in large intestine. Break down mechanically and chemically food molecules. Enzymes convert macromolecules to forms that can be absorbed and processed. Break down triglycerides and phospholipids into fatty acids. Break down proteins into shorter polypeptides single amino acids as well. Break down polysaccharides into oligosaccharides also into single sugars. For example, in the lumen of the gi tract. Stomach secretes hcl and pepsinogen -> pepsin enzyme that degrades carbohydrate enzymes that breakdown proteins. Mucus secreted by the stomach coats and protects the wall of stomach being digested. Esophagus must be very smooth, allow food to pass.