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Digestion - Digestion Food processing Ingestion Digestion...

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1 Digestion (Chap. 45 pgs 877 to 885) Digestive systems Food processing Ingestion Digestion Absorbtion Elimination Digestion – Heterotrophs take in and break down complex organic molecules into smaller molecules that can be taken into cells Food ATP Work Done Heat Cellular respiration Hydrolysis of ADP + P Run the systems of the body Make compounds Grow and repair tissues Digestive Systems (d.s.) Phagocytosis Intracellular (Amoeba) Spongocoel Intracellular (Sponge) Gastrovascular cavity Incomplete d.s. (Hydra) Gastrovascular cavity Incomplete d.s. (Flatworms) One way tube Complete d.s. (Round Worms) One way tube Complete d.s. (Humans) Food Processing Ingestion Digestion Absorbtion Elimination Food passes in sequence through the GI tract Mouth, Pharynx, Esophagus, Stomach Small intestine, Large intestine, Rectum, and Anus Accessory organs: Salivary gland Liver Pancreas Gall bladder Walls of the digestive system Mucosa Submucosa Muscularis Visceral Peritonium Fig. 45.5
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2 Food processing begins In the mouth Mastication Saliva - Salivary amylase Starch sugars - Mucus: lubricates - Antibacterial substances Tongue - Forms food into a bolus Pharynx and Esophagus Pharynx (throat) Epiglottis Esophagus Peristalsis: Wave of smooth muscle contraction Swallowing reflex DIGESTION Stomach Functions Storage Mixing Some Digestion Some Absorbtion Muscular organ Circular Longitudinal Oblique Rugae Gastric mucosa Gastric glands Chief cells Parietal cells pepsinogen HCL Pepsinogen + HCL Pepsin Mucous cells: Acid protection Fig. 45.9 Gastric pit Stomach
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