HLTH1030 Lecture 15: HLTH1030-Lecture 15
7 Nov 2018
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Document Summary
Functions in extracellular digestion plus distribution of nutrients. Digestive tubes with two openings (mouth and anus) Organs of the digestive system fall into two groups: alimentary canal: Four main layers: mucosa, submucosa, muscularis, serosa. Processing of food involves six essential activities: ingestion uptake of food, propulsion including peristalsis, digestion mechanical and chemical, absorption uptake of nutrients, compaction absorption of water, defecation/excretion elimination. Bounded by lips anteriorly, cheeks laterally, palate superiorly, and tongue inferiorly. Keratinized in areas subject to food abrasion: gums and hard palate. Nonkeratinized floor of mouth, soft palate, and insides of cheeks and lips. Lips (labia) important for suckling by infant mammals. Chewing important for mechanical break down of food. Incisors: anterior part of mouth -> scraping or biting -> scoop shaped and smaller. Canines: usually for ripping or tearing meat, long and pointed. Premolars: posterior to the canines, can be flat for grinding, or sharp and serrated for tearing meat.
