Human's Digestive System

Human's Digestive System - AP Biology Human's Digestive...

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AP Biology Human’s Digestive System - Main Pathway: Mouth → Esophagus → Stomach → Duodenum → Small Intestine → Large Intestine → Anus 1) Mouth (1st Carbohydrate Digestion) a) The food is broken down into small pieces by teeth (Mechanical Digestion) b) Amylase is involved and polysaccharide is changed to monosaccharide or disaccharide, but not a complete digestion 2) Esophagus a) A pathway from the mouth to the stomach through the muscle movement called peristalsis b) No digestion process occurs since there are no digestive enzymes c) When not swallowing, Esophageal sphincter muscle is contracted Epiglottis is up Glottis is open (allow air to come in) d) When swallowing, Esophageal sphincter muscle is relaxed Epiglottis down Glottis is closed 3) Stomach (1st Protein Digestion) a) Contains gastric juice (HCl + water, mainly water) b) HCl (Hydrochloric Acid) Kills bacteria and viruses Makes the stomach really acidic – pH 2 Activates pepsinogen by breaking down into pepsin Pepsinogen
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Human's Digestive System - AP Biology Human's Digestive...

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