Human Systems: Digestive System

Digestive system Digestion Absorption Assimilation

Digestive system Made up of tube like organs called digestive tract Mouth, pharynx, esophagus, stomach, small and large intestines, rectum and anus Salivary gland, liver, pancreas, and gall bladder also contribute but food does not pass through them

Digestive system Breaking down food Mechanical Chemical Carbohydrates, proteins, fats Enzymes for digestion

Digestive system Digestion begins in mouth Teeth (enamel) Role of saliva

Digestive system Leaving the mouth Esophagus peristalsis antiperistalsis

Digestive system Stomach Muscular sac- like organ Squeeze food Acid and enzymes for digestion Acid kills microbes as well Leaving the stomach Chyme (chyme is acidic) Stomach releases chyme into small intestine

Digestive system Pancreas Produce secretions to reduce acidity (bicarbonate) Produce digestive enzymes Chyme does not enters the pancreas

Digestive system Small intestine Muscular long tube Villi increase surface area, facilitate absorption

Digestive system Liver and gall bladder Breaks down toxins, stores materials, produce bile Bile is made by liver, stored in gall bladder, secreted in small intestine Role in fat digestion

Digestive system Large intestine Stores, compacts and eliminates undigested material Absorption of water Undigested waste – feces or stool Stored in last part of intestine – rectum Excreted through anus Fiber and digestion

Digestive system

Disorders Ulcers Liver disorders (infections and cancer) Diarrhea and constipation Appendicitis Colon cancer