Digestion 08 final version

Digestion 08 final version - Digestion Digestive system...

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1 Digestion (Chap. 45 pgs 877 to 885) Digestive system 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 Ingestion: behavioral & morphological adaptations Absorbtion: mechanism to take molecules into cells Elimination: Undigested material
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2 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 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 Swallowing Reflex Peristalsis
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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 Stomach Functions
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Digestion 08 final version - Digestion Digestive system...

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