1. Digestive System

2. Digestive System
The functions of the digestive system are to take in food, break down food and absorb nutrients, and get rid of undigested material
The digestive system includes:
Mouth
Pharynx
Esophagus
Stomach
Small intestine
Large intestine
Rectum

3. Starting digestion Teeth break food into smaller pieces
Saliva contains amylases that breakdown carbohydrates
Passing of food through pharynx triggers a swallowing reflex

4. Getting food to the stomach
Esophagus – connects mouth to stomach
Uses smooth muscle contractions to push food down
Peristaltic contractions

5. Digestion Takes Place in Stomach
Food entering the stomach is regulated by the sphincter
Prevents acid soaked food from re-entering the esophagus
Gastric juices are secreted by cells that line the stomach
Pepsin – breaks down proteins
2-6 hours for digestion
Mucus protests the lining of the stomach

7. Small Intestine
Duodenum receives secretions from the pancreas, liver , and gall bladder.
Further digestion
Bile secreted by the gall bladder breaks up fat
Villi and microvilli increase surface area for absorption

9. The Large Intestine
Food not absorbed (wastes) moves into the large intestive
Contains dead cells mucus, digestive enzymes, bacteria, and yeast
Bacteria synthesize some vitamins
Aid in breaking down undigested materials
Wastes are eliminated through the rectum

10. Liver Bile production Converts extra sugar to glycogen for storage
Detoxifies the poisons in the blood

11. Disorders of the liver Peptic ulcer Appendicitis Gallstones Jaundice
Cirrhosis of the liver