1. Digestive System Parts and Function

2. Digestion involves:
Breaking down of food into smaller pieces
The mixing of food
Movement through the digestive tract
Chemical breakdown of the large molecules of food into smaller molecules.

3. Digestion
Breaks down
Carbohydrates (starch and sugar) → single sugar molecules
Proteins → amino acids
Fats → fatty acids, glycerol

4. Enzymes
Proteins that break bonds

5. The Digestive System
Is a long tube from the mouth to the anus

6. Peristalsis
Muscular contractions that move food along throughout Digestive System

7. Mouth
Mechanical digestion - Teeth bite off and chew food into a soft pulp that is easy to swallow.
Chemical digestion – saliva

8. Esophagus
The esophagus is a muscular tube. It takes food from the throat and pushes it down through the neck, and into the stomach.
It moves food by waves of muscle contraction called peristalsis.

9. Stomach
The stomach has thick muscles in its wall. These contract to mash the food into a water soup called chyme.
The stomach lining produces strong digestive juices.

10. Small Intestine
The nutrients are broken down small enough to pass through the lining of the small intestine, and into the blood.
Nutrients are carried away to the liver and other body parts to be processed, stored and distributed.

11. Large Intestine Water is absorbed.
The remains are formed into brown, semi-solid feces, ready to be removed from the body

12. Rectum
Rectum’s job to receive stool from the colon, to let the person know that there is stool to be evacuated, and to hold the stool until evacuation happens.

13. Anus
Anus- It lets you know whether the contents are liquid, gas, or solid. The anus is surrounded by sphincter muscles that control of movement of stool.

14. Liver
It stores some nutrients, and releases them into the blood according to the activities and needs of the body (helps the body maintain homeostasis)

15. Gall Bladder
Bile (enzyme) flows from the gall bladder along the bile duct into the intestine to aid in chemical digestion.

16. Pancreas
Makes digestive juices called enzymes which help to digest food.

17. Mechanical Digestion Involves the physical breakdown of food
Occurs in the:
Mouth – teeth and tongue
Esophagus – peristalsis
Stomach – muscular churning
Small Intestine – Bile and peristalsis

18. Chemical Digestion
Food is converted into substances that can be absorbed by the body in the small intestine
Occurs in the mouth (saliva), stomach (acids), small intestines (enzymes)