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(Digestive System – Journey of Food) - Coggle Diagram
Digestive System – Journey of Food
Mouth (Ingestion)
Teeth: Chewing (Mechanical digestion)
Saliva: Contains salivary amylase (Starts starch digestion)
Tongue: Rolls food into bolus
Pharynx & Esophagus (Swallowing)
Epiglottis: Prevents entry into windpipe
Peristalsis: Pushes food down the esophagus
No digestion here
Stomach (Churning & Digestion)
Gastric juices: HCl + pepsin (Protein digestion)
Mechanical churning
Mucus protects stomach lining
Chyme is formed (semi-liquid food)
Small Intestine (Digestion & Absorption)
Duodenum
Bile from liver (via gallbladder): Emulsifies fats
Pancreatic enzymes: Digest proteins, carbs, fats
Jejunum & Ileum
Absorption of nutrients
Villi and microvilli increase surface area
Nutrients enter blood and lymph
Large Intestine (Water Absorption)
Absorbs water and electrolytes
Forms feces
Gut bacteria produce vitamins (like Vitamin K)
Rectum & Anus (Egestion)
Feces stored in rectum
Expelled through anus (defecation)
Supporting Organs
Liver: Produces bile
Gallbladder: Stores and releases bile
Pancreas: Produces digestive enzymes
Salivary glands: Start carbohydrate digestion
Key Terms
Ingestion
Digestion (Mechanical & Chemical)
Absorption
Assimilation
Egestion