Digestive Art ppt heat temperSystem.pptx

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1. Your Digestive System

2. What major tasks does your digestive system help you accomplish?

3. Your Digestive System… … breaks down food into molecules the body can absorb for energy . …passes these molecules into the blood to be carried throughout the body . …works to eliminate solid wastes from the body.

4. The Parts of Your Digestive System How well do you know them?

5. Parts of Your Digestive System

6. Now for the Digestive Journey...

7. The Digestive Journey Digestion begins in your mouth with action of your teeth and tongue (mechanical digestion ) and your salivary glands (chemical digestion). The salivary glands produce enzymes that are mixed with the food, breaking down the starches. Peristalsis is the muscular action that moves the food through the esophagus and into your stomach after you swallow.

8. Your Stomach The food moves into your stomach , which contains chemicals that break down the food. Your stomach gradually releases these materials into the small intestine where digestion is completed. Your stomach also has a thick coating of mucus to protect it f ro m the acids and to keep it from digesting itself!

9. By the way, your stomach really does look like a muscular bag!

10. Your Liver, Pancreas, and Gall Bladder Y our liver is the largest and heaviest organ of your body. It breaks down many substances and toxins, and produces bile . The bile flows from the liver into the gall bladder , where it is stored until needed. The pancreas produces more enzymes that flow into the small intestines, helping to break up food particles .

11. Your Small & Large Intestines After the solid food has been digested the fluid remaining is called chyme When it is thoroughly digested it passes through an opening into the small intestines . In the small intestines all the nutrients are absorbed leaving undigestible wastes. These wastes pass into the large intestines , where water is removed. Then the wastes are stored in the rectum until they are released by the anus .

12. Cross Section of Your Intestines The Villi add surface area to increase absorption of food and nutrients. Cross section of intestine showing finger-like villi in the center. Single villi showing capillaries inside where molecules are transferred into bloodstream.

13. The Digestive System Purpose : to convert food particles into simpler molecules that can be absorbed into the bloodstream and used by the body f or energy Major Organs and their Functions: Mouth – to chew and grind up food -- saliva also begins the chemical breakdown Esophagus – pipe connecting mouth to stomach Stomach – secretes an extraordinarily strong acid that leads to breakdown of food

14. Pancreas – produces enzymes Liver – produces bile, which breaks down fats in foods Gallbladder – stores bile for future use Small Intestine – where nutrients are absorbed into the bloodstream -- propelled along by folded fingerlike surfaces called villi , on the intestine Large Intestine – removes water and gets the waste ready for excretion

15. The Digestive System