The Gastrointestinal Tract

The Gastrointestinal Tract - The Gastrointestinal Tract...

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The Gastrointestinal Tract Definitions Digestion- the process of making food absorbable by dissolving it and breaking it down into simpler chemical compounds that occurs in the living body chiefly through the action of enzymes secreted into the alimentary canal Alimentary canal- the tubular passage that extends from mouth to anus and functions in digestion and absorption of food and elimination of residual waste Classification of Animals Carnivores- eat animal tissue (dogs and cats) Omnivores- eat plant and animal tissue (humans and pigs) Herbivores- eat plant tissue (horse, cattle, sheep, goats, rabbits) The Process of Digestion Digestion is an active process consisting of three mechanisms of action: 1) Mechanical action- chewing and contraction of the intestinal tract 2) Chemical action- HCl in the stomach and bile in the small intestine 3) Enzymatic action- carbohydrases, peptidases, lipases Mouth Mastication (chewing- mechanical digestion) Saliva added to the ingested food
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The Gastrointestinal Tract - The Gastrointestinal Tract...

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