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Download Comparative Digestive Systems Topic 3024
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Comparative Digestive Systems Topic 3024 Amanda Moore Torey Birchmeier Modified by Ashlee Gibson Digestive Systems Overviews Digestion • Digestion: Breaking down large, ______________________________________ into simpler molecules for use by an organism. • Food enters the mouth and goes through ______________ and ________________ changes as it passes through the alimentary canal. Types of Stomachs • _________________________________ – Man, Pig • _________________________________ – Cattle, Sheep, Goats • ___________________________________ ___________________ – Horses, Rabbits, Guinea Pigs Parts of Digestive Tract • ____________: initial opening of alimentary canal – ________________________________ • secrete juices that contain enzymes to help break up the food – Mastication • chewing, crushing, preparing food for swallowing Parts of Digestive Tract • _____________: funnel shaped muscle between mouth and esophagus – part of digestive and respiratory tracts • Esophagus: __________________________________ – muscle contractions move food down to stomach Parts of Digestive Tract • Stomach: located between esophagus and small intestine – Two basics types • _________________________________ • _________________________________ Parts of Digestive Tract Simple Stomach • Humans, swine, rabbits and horses – Divided into three regions • _____________________ • _____________________ • _____________________ Simple Stomach • Digestion: – ______________________________________ ______________________________________ – Is ________________, enzymes soften and break down macromolecules of food • enzymes are catalysts, they start the chemical reactions Simple Stomach • ________________ that break down food – Gastric-break down proteins in stomach – Liver and pancreatic-break down fats in small intestine – Intestinal-break down carbohydrates and proteins in small intestine Parts of Digestion Tract Ruminant Stomach • Sheep, Cows and Goats • Occupies 3/4 of the abdominal cavity Four Components of Ruminant Stomach • __________________________ – composes 80% of ruminant stomach in mature bovine animals and 30% in young animals • _________________________________ – composes about 5% of bovine stomach – prevents indigestible objects from entering the stomach Four Components of Ruminant Stomach • _______________________________ – composes 7-8% of bovine stomach – absorbs mostly water • _______________________________ – the “true” stomach – composes 7-8% of stomach in mature animals and 70% in young animals Digestion in the Ruminant Stomach • ______________________: The process of ___________________, _______________, _______________ and _______________ of food. • Purpose: To smash and break up food which provides more surface area bacteria to break down Parts of Digestive Tract • _________________: long, coiled tube connecting the stomach with the large intestine. – Is covered by ________________ which increases surface area to increase absorption – Food moves through by muscle contractions called ___________________________ – Final breakdown and absorption of nutrients occurs here Parts of the Digestive Tract • Large Intestine – Includes _______________, ___________ and _____________________________ – __________________________________ – Very little nutrient absorption takes place here Parts of the Digestive Tract Accessory Organs • __________________________________ – secretes ________________which breakdown fat and starches • ______________________________ – secrets _______________ which digest fats
