11:067:330 Lecture 3: Comparative Anatomy (Cpt 2)
21 Jul 2017
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Form and function organs with similar functions usually have similar forms across species. Animals classified as carnivores, omnivores, and herbivores. Carnivores consume a predominantly meat-based diet. Herbivores consume a predominantly plant-based diet. Omnivores consume both meat and plants (usually based on what is available) Nonfunctional in other species (ex. appendix in humans) (6) large intestine (colon): fiber fermentation and absorption of water, feces formation (7) rectum: holds feces prior to elimination. Dog vs mink digestive tract (both carnivores): Stomach is a food reservoir + very expansive (swallow large chunks of meat) initial protein digestion. Small intestine is relatively short but wide (for large pieces of food to move) Small cecum with little function (mink and ferret don"t even have one) Colon is a storage unit fermentation of fiber not very nutritive for carnivores. Pig sent to market at ~100-125kg, adult can weigh 200kg or more. Digestive tracts are more generalized rather than specialized. Pig vs rat digestive tract (both omnivores):
