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DIGESTIVE SYSTEM

Learn about how the digestive system breaks down food mechanically and chemically from mouth to intestine. Discover the role of enzymes, acids, and organs like the liver. Understand peristalsis and absorption in the body.

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DIGESTIVE SYSTEM

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  1. DIGESTIVE SYSTEM

  2. WHAT IS THE JOB OF THE DIGESTIVE SYSTEM? • TO BREAK DOWN FOOD INTO BIOMOLECULES THAT CELLS CAN USE.

  3. WHERE DOES DIGESTION BEGIN? • THE MOUTH- begins mechanical digestion

  4. HOW IS FOOD MECHANICALLY BROKEN DOWN IN THE MOUTH? • CHEWING WITH YOUR TEETH BREAKS FOOD INTO SMALLER PIECES.

  5. HOW IS FOOD CHEMICALLY BROKEN DOWN IN YOUR MOUTH? • BY SALIVA THAT CONTAINS ENZYMES • Enzyme called amylase begins to break down starches

  6. Food moves from the mouth to the esophagus…. • the tube connecting your mouth to your stomach.

  7. THE ESOPHAGUS MOVES THE PARTIALLY DIGESTED FOOD TO THE… • STOMACH- continues mechanical digestion by churning food.

  8. WHAT IS PERISTALSIS? • SMOOTH MUSCLES THAT CONTRACT TO MOVE FOOD DOWN THE ESOPHOGUS

  9. GASTRIC JUICE IS RELEASED INTO THE STOMACH TO BREAKDOWN FOOD. WHAT IS GASTRIC JUICE? • A MIXTURE OF MUCUS, WATER, ENZYMES, & ACIDS • Hydrochloric acid (stomach acid) has a pH of about 1-2. Very acidic!

  10. WHERE DOES THE FOOD GO ONCE IT LEAVES THE STOMACH? • TO THE SMALL INTESTINE

  11. Intestines have many folds • Folds are called villi • They increase surface area to absorb nutrients

  12. PANCREATIC ENZYMES WILL HELP FINISH BREAKING DOWN • CARBOHYDRATES AND PROTEINS

  13. THE LIVER MAKES • BILE- BREAKS DOWN FATS

  14. YOUR DIGESTED FOOD MOVES INTO YOUR BLOOD STREAM. WHERE DOES THE UNDIGESTED FOOD AND EXCESS WATER GO? • TO THE LARGE INTESTINE

  15. WHAT HAPPENS TO THE EXCESS WATER? • IT IS REABSORBED INTO THE BODY THROUGH THE WALLS OF THE LARGE INTESTINE

  16. DIARRHEA OCCURS WHEN… • Your large intestine can’t reabsorb excess H2O… • This makes your stool (feces) watery!

  17. WHAT HAPPENS TO THE UNDIGESTED FOOD • IT IS EXPELLED FROM THE BODY

  18. FOOD NEVER PASSES THROUGH THE LIVER OR PANCREAS FOR DIGESTION. • MOUTH  ESOPHAGUS  STOMACH  SMALL INTESTINE  LARGE INTESTINE  WASTE LEAVES THE BODY.

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