Chapter 43 DIGESTION

Chapter 43 DIGESTION - Chapter 43 ANIMAL NUTRITION...

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Chapter 43 ANIMAL NUTRITION Digestion and Absorption Summary *Digestive system *Digestive Tract Organs *Accessory Organs *Mechanical and Chemical Digestion *Neural/hormonal control of Digestion Types of Digestive Systems *Heterotrophs ingest autotrophs (plants) and other heterotrophs. *Evolution of a digestive tract includes regions for storage & mechanical and chemical digestion. *In most animals, bacteria live in the digestive tract to aid in digestion. *Digestion is the breakdown of food into nutrients. Vertebrate Digestive Systems *Digestive tract organs, fig 43.5. *Accessory organs *Salivary glands, tongue, teeth *Pancreas *Liver/Gall bladder Vertebrate Digestive Systems *Layers of GI tract walls. *Mucosa *Submucosa *Muscularis *Serosa * Mouth and Pharynx *Ingestion of food *Mechanical digestion (teeth , gizzard ) *Mixing of food with fluid, saliva, also some chemical digestion of carbohydrates (amylase ). *Babies have lipase. 1
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*Swallowing – involves tongue, soft palate and glottis/epiglottis. *Teeth *Types of teeth *Incisors – biting and cutting *Canines – tearing *Premolars and molars – grinding *Human adults have 32 teeth, children have 20.
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This note was uploaded on 09/08/2011 for the course BIOL 1403 taught by Professor Dini during the Fall '09 term at Texas Tech.

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Chapter 43 DIGESTION - Chapter 43 ANIMAL NUTRITION...

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