digestion - It takes over 3 hours of walking to burn the...

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It takes over 3 hours of walking to burn the calories in a quarter-pound hamburger with cheese. A human produces over 1 liter of saliva a day. Autotrophs can manufacture food from inorganic molecules (photosynthetic plants) Heterotrophs are not able to carry out photosynthesis Ingestion: physical act of taking in food Teeth are adapted to different diets Incisors – biting, clipping, etc Canines – gripping, tearing, fighting Molars – grinding, Premolars – gripping and tearing Digestion: the hydrolysis of macromolecules into smaller molecules Intracellular digestion occurs within the cell Extracellular digestion occurs outside the cell; occurs more frequently in man than intracellular Peristalsis – muscular contractions that propel food down esophagus Sphincters – valves that control the passage of food from one part of the digestive tract to another Regions of stomach: Cardiac Fundie Body Pyloric Small intestine – most of digestion and absorption takes place here Duodenum – first part of the small intestine that receives pancreatic enzymes and
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This note was uploaded on 04/07/2008 for the course BIOL 1406 taught by Professor Stephens during the Spring '08 term at College of the Mainland.

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digestion - It takes over 3 hours of walking to burn the...

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