DIGESTIVE SYSTEM WHAT IS THE JOB OF THE

DIGESTIVE SYSTEM

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

WHERE DOES DIGESTION BEGIN? l THE MOUTH- begins mechanical digestion

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

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

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

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

WHAT IS PERISTALSIS? l SMOOTH MUSCLES THAT CONTRACT TO MOVE FOOD DOWN THE ESOPHOGUS

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

WHERE DOES THE FOOD GO ONCE IT LEAVES THE STOMACH? l TO THE SMALL INTESTINE

Intestines have many folds Folds are called villi l They increase surface area to absorb nutrients l

PANCREATIC ENZYMES WILL HELP FINISH BREAKING DOWN l CARBOHYDRATES AND PROTEINS

THE LIVER MAKES l BILE- BREAKS DOWN FATS

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

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

DIARRHEA OCCURS WHEN… Your large intestine can’t reabsorb excess H 2 O… l This makes your stool (feces) watery! l

WHAT HAPPENS TO THE UNDIGESTED FOOD l IT IS EXPELLED FROM THE BODY

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