BIOL 103 Lecture Notes - Lecture 2: Urea Cycle, Tsetse Fly, Small Intestine
19 Apr 2017
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Document Summary
Absorbtion: absorption of the digested products, vitamins, minerals and water occurs in the small intestine, digestion broken down. This is assisted by the huge surface area of the small intestine contributed by the villi (contains lacteals and capillaries) and microvilli. Small intestine is lined with villi which are finger like pieces of tissue on the inner wall: microvilli are fingerlike projections on individual epithelial cells. Increases the amount of surface area that is able to absorb nutrients: digestion in insects. Similar to digestion in vertebrates but no pepsin: no pepsin because insects have neutral or high ph which denatures pepsin. Salivary glands (tsetse fly: blow flies have active proteases eliminated with feces which breaks down the food they are trying to eat. Food is either put through the digestion process or goes undigested and is excreted. Fish (bony fish) and tadpoles produce ammonia and water and it is released as nitrogenous waste without the urea cycle.
