CAS BI 315 Lecture Notes - Lecture 7: Asthma, Hemoglobin, Amylase
9 Jan 2017
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Primary functions: digest food too large to move across the epithelium of gi tract o chemically o assist this process with mechanical activity. Ex: when stomach is expanded, it releases a hormone that suppresses your appetite. Ex: broken-down hemoglobin fragments can be pooped out. Saliva: contains mucus, moistens and lubricates the food particles before swallowing, contains amylase, which partially digests polysaccharides, dissolves some of the food molecules o once dissolved, can react with chemoreceptors, giving sense of taste, antibacterial properties. Pharynx and esophagus: do not contribute to digestion, muscles in the walls control swallowing. Secrete acid and intrinsic factor o chief cells. Release histamine, and endocrine cells called d cells: d cells secrete somatostatin. Emulsify the fats in chyme: you can live without your gallbladder o you wouldn"t be able to store bile, so feedback mechanisms would slow the liver down so you don"t produce as much bile. You eat normally, just reduce fat content of your meals.
