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By:Isabella Izquierdo

The Digestive System. By:Isabella Izquierdo. Digestion is the mechanical and chemical breaking down of food in components that the b ody can use. What is digestion?. There are two types of digestion: Mechanical (physical )

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By:Isabella Izquierdo

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  1. The Digestive System By:Isabella Izquierdo

  2. Digestion is the mechanical and chemical breaking down of food in components that the body can use. What is digestion?

  3. There are two types of digestion: • Mechanical (physical) Is where food is physically broken into smaller pieces. That happens in the mouth • Chemical Is where the food is chemically broken down into subatomic particles, starting with saliva in the mouth and continuing through the small intestine.

  4. Why is digestion important? The digestive system processes food into useable nutrients and distributes them into the blood stream to go to different parts of the body.

  5. Ingestion • Movement • Mechanical and Chemical Digestion • Absorption • Elimination The Phases

  6. Mouth • Pharynx • Esophagus • Stomach • Small intestine • Large Intestine • Rectum • Liver, gallbladder, pancreas Down your body

  7. Mouth • Teeth mechanically break down food into small pieces. Tongue mixes food with saliva (contains amylase, which helps break down starch).

  8. Esophagus • Approximately 10” long • Functions include: • Secrete mocus • Moves food from the throat to the stomach using muscle movement

  9. Stomach • J-shaped muscular bag that stores the food you eat, breaks it down into tiny pieces. • Mixes food with digestive juices that contain enzymes to break down proteins and lipids. • Acid in the stomach kills bacteria. • Food found in the stomach is called chyme.

  10. Small Intestine • Small intestines are roughly 7 meters long • Lining of intestine walls has finger-like projections called villi, to increase surface area. • The villi are covered in microvilli which further increases surface area for absorption.

  11. Large Intestine • About 5 feet long • Accepts what small intestines don’t absorb • Rectum (short term storage which holds feces before it is expelled).

  12. Accessory Organs • Not part of the path of food, but play a critical role. • Include: Liver, gall bladder, and pancreas

  13. Fun Facts • HOW LONG ARE YOUR INTESTINES? At least 25 feet in an adult. Be glad you're not a full-grown horse -- their coiled-up intestines are 89 feet long! • Food drying up and hanging out in the large intestine can last 18 hours to 2 days! • In your lifetime, your digestive system may handle about 50 tons!!

  14. Bibliography • http://wiki.answers.com/Q/Why_is_the_Digestive_System_important • http://www.brainpop.com/health/bodysystems/digestivesystem/ • http://kidshealth.org/kid/htbw/digestive_system.html • http://www.freeclubweb.com/powerpoints/science/humanbody/human-digestive-system.html

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