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Digestive System.

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Presentation on theme: "Digestive System."— Presentation transcript:

1 Digestive System

2 Objectives Describe digestion
Identify and explain the function of each organ of the system Explain preventative measures for digestive disorders Describe problems associated with the system

3 Functions of Digestive System
Digestion-mechanical and chemical breakdown of foods by the body’s cells Absorption-passage of digested food from digestive tract to the circulatory system Elimination-expulsion of undigested food or body waste

4 Structure of System MESSLA
Mouth Esophagus Stomach Small Intestine Large Intestine Anus Organs that help-liver , gall bladder, pancreas

5 Mouth Ingestion: Taking of food into the body Structures are:
Teeth: Break down food Mastication: Process of chewing Salivary Glands: Saliva breaks down food, makes it easier to swallow Tongue: Prepares food to swallow

6 Esophagus Muscular tube extending from mouth to the stomach
Peristalsis: Series of involuntary muscular contractions

7 Stomach Hollow, saclike organ enclosed in a muscular wall (3 layers of muscles) Function of the stomach is: Continue to breakdown food Store food until it’s ready to enter small intestine

8 Stomach Control rate at which food enters small intestine
Mix food and gastric juices (contain pepsin and hydrochloric acid) Chyme: creamy fluid mix of food and gastric juices

9 Small Intestine Major part of digestion and absorption occur here
20-23 feet in length, 1 inch in diameter Chyme enters small intestine and peristalsis moves it at a slow rate (3-5 hours)

10 Villi: Fingerlike projections (Increase surface area)
Absorb digested food particles Undigested food leaves as liquid and fiber

11 Large Intestine (Colon)
Absorbs water and eliminates undigested food 5-6 feet in length, 2 ½ inches in diameter Bacteria changes undigested food into feces

12 Pancreas – produces the hormone insulin that regulates blood sugar levels
-- also help neutralize stomach acid Liver – produces bile, which breaks down fats in foods Gallbladder – pouch-like organ that stores bile for future use

13 Digestive System Crash Course

14 Care and Problems with the System

15 Problems with System Functional Problems
Indigestion Heartburn Gas Nausea Diarrhea Constipation

16 Problems with System Structural Digestive problems
Gallstones-crystals that form in gall bladder. Appendicitis-inflammation of appendix Gastritis-inflammation of mucous membranes that line stomach Lactose Intolerance-inability to digest lactose Peptic Ulcer-sore in lining of tract Colitis-inflammation of colon Hemorrhoids-swollen veins in lower rectum/anus Tooth Decay

17 Care of the System Eat a variety of foods. Avoid too many fatty foods
Choose foods low in fat and high in fiber Do not hurry through meals Do not wash food down with liquid Drink plenty of water

18 1) Digestive System Worksheet 2) Choose one of the following and find a current event article:
Celiac Disease Diabetes Crohn’s Disease Peptic Ulcer Diverticulitis

19 Fiber Do you get yours?

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