01:119:116 Lecture Notes - Lecture 22: Parietal Cell, Riboflavin, Monoglyceride
21 Apr 2016
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Introduction: all animals are heterotrophs, stages of food processing. B. 1. b) filter feeding (sponges, baleen whales) substrate feeding - animal lives on/inside food source (caterpillar in leaf) Bulk feeding - take in relatively large meals and sometimes. Elimination: undigested material passed out of digestive system: digestive compartment (enzymes hydrolyze tissue) Food vacuole fuse with lysosomes hydrolytic enzymes. Alimentary canal - one way tube with 2 openings, complete digestive system. Human digestive system: components of the human digestive system. Accessory glands - secrete digestive juices via ducts (exocrine) Bolus moved through esophageal sphincter into esophagus hydrolyze starch and glycogen polysaccharides and maltose. Mucus - contain mucins (protect lining of mouth) Ends at the cardiac sphincter (valve at junction between esophagus and stomach): controlled by circle of smooth muscle. Peristalsis: gets bolus into stomach; moves food through digestive tract. Chief cells pepsinogen (inactive precursor of pepsin) Parietal cells pump h+ into lumen, cl- diffuses out.
