BIOL 1050 Lecture Notes - Lecture 13: Cecum, Abomasum, Propionate
17 Oct 2016
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Document Summary
Four main components to digestion ingestion; digestion; absorption; elimination. Herbivores eat herbaceous plants; grazers eat grasses and legumes; browsers eat woody plants. Biting and chewing: harvesting food, grinding and mechanical breakdown. Salivation: add water to food, add enzymes (salivary amylase glycogen and starch) Swallowing: move bolus of food to stomach (or whatever is rst) Stomach: gastric juice hcl + pepsin: hcl reduce ph and mechanical protein breakdown, pepsin proteins broken down into polypeptides, secrete pepsinogen and hcl breaks it down to pepsin. Variants: birds crop replace teeth with grinding function, ruminants 3 compartments ahead of stomach, hindgut fermentors larger cecum and large intestine. Ruminants: three compartments evolved from the esophagus: reticulum rumination. Rumen bypass in calves: rumen micro ora to digest complex carbs. Microbes die and become protein: omasum absorb water from rumen contents, abomasum(stomach) breaks down proteins. Cecum is enlarged symbiotic bacterial digestion similar to ruminant.
