DIGESTIVE SYSTEM -CHAP 24-WK9 - DIGESTIVE SYSTEM CHAPTER...

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DIGESTIVE SYSTEM CHAPTER 24-WEEK 9 “He that would have the fruit must climb the tree.” Dr. Thomas Fuller (1608-1661);
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What do animals need to live? Animals make energy using: Glucose from food and oxygen Animals build bodies using: Nutrients from food as raw materials amino acids, sugars, fats, nucleotides ATP energy for synthesis O 2 food ATP mitochondria
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Passage of Food Through the Gastrointestinal Tract Ingestion taking in food Digestion mechanical digestion breaking up food into smaller pieces chemical digestion break down into molecules for absorption into cells enzymes Absorption Movement of nutrient from intestine to the blood. diffusion active transport Egestion Elimination of undigested material
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ORGANS OF DIGESTIVE TRACT Mouth - Chewing, swallowing, lubrication Pharynx (Throat) - Swallowing Esophagus Transportation tube Stomach Storage and digestion of protein and carbohydrate Small Intestine - D igestion and absorption Large Intestines - Absorption of water, Waste storage Anus - Elimination of waste
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ACESSORY ORGANS Salivary Glands - Secrete salivary amylase Liver - Produces bile Gallbladder - Storage of bile Pancreas - Secretes pancreatic amylase, trypsin and chymotrypsin
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Digestive system
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Fig. 24.18b DIGESTIVE SYSTEM
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Mouth The Beginning of digestive Process Functions Mechanical break down: Chewing Chemical Breakdown: Saliva contains amylase , an enzyme that digests starch Lubrication : Saliva is added moistens food
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ESOPHAGUS A tube between the mouth and stomach – peristalsis (contraction- relaxation of the muscles) aides in swallowing
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Fig. 24.21a Anatomy of the Stomach
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Fig. 24.21
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Stomach Physical Mixes food Storage Chemical Goblet cells make mucus Parietal cells Make hydrochloric acid Chief cells Pepsin : an enzyme that breaks down large proteins into amino acids .
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