DIGESTIVE SYSTEM DIGESTION THE BREAK DOWN OF FOOD
DIGESTIVE SYSTEM
DIGESTION • THE BREAK DOWN OF FOOD INTO NUTRIENTS.
ENZYMES • CONTROL CHEMICAL REACTIONS IN THE BODY
MOUTH • CONTAINS SALIVARY GLANDS • SALIVA CONTAINS PTYALIN WHICH BREAKS DOWN STARCHES TO SUGARS
TEETH • INCISORS-CUT FOOD • CANINESSHRED FOOD • MOLARSGRIND FOODS
TASTE BUDS • SWEET-TIP OF TONGUE • SOUR- SIDES OF TONGUE • SALTY-SIDES OF TONGUE • BITTER-BASE OF TONGUE
ESOPHAGUS • CONNECTS MOUTH TO STOMACH • ABOUT 10 INCHES IN LENGTH • LINED WITH SLIPPERY MUCUS
PERISTALSIS • WAVES OF MUSCLE CONTRACTIONS IN THE ESOPHAGUS
STOMACH • 12” LENGTH • CELLS IN THE STOMACH WALL RELEASE GASTRIC JUICES
GASTRIC JUICES • CONTAIN THE ENZYME PEPSIN • HYDROCHLORIC ACID • THICK SLIPPERY MUCUS
IN THE STOMACH • MECHANICAL AND CHEMICAL DIGESTION • ENZYMES=CHEMICAL • MUSCLES CHURN FOOD= MECHANICAL
IN THE STOMACH • FOOD DIGESTED 3 -6 HOURS • FOOD LEAVES AS A SOFT WATERY SUBSTANCE
SMALL INTESTINE • WHERE MOST OF THE DIGESTION TAKES PLACE • 16. 5 -32. 8’ (18’)
SMALL INTESTINE • CELL LINING THE WALLS RELEASE CHEMICAL ENZYMES
LIVER • THE LARGEST AND HEAVIEST ORGAN • PRODUCES BILE WHICH HELPS IN DIGESTION
CONTINUED • IT SENDS BILE TO THE GALL BLADDER
BILE • BREAKS UP FAT INTO SMALLER PARTICLES
PANCREAS • CREATES PANCREATIC JUICE • THESE ENZYMES BREAK DOWN PROTEINS, STARCHES, AND FATS
ABSORPTION OF FOOD • PROTEIN-TO AMINO ACIDS • CARBOHYDRATES(STARC HES AND SUGARS)-TO SIMPLE SUGARS • FATS-TO FATTY ACIDS AND GLYCEROL
ABSORPTION • NUTRIENTS ARE ABSORBED THROUGH THE WALLS OF THE SMALL INTESTINE INTO THE BLOODSTREAM
LARGE INTESTINE • ABOUT 5’ IN LENGTH • FOOD STAYS IN LARGE INTESTINE 18 -24 HOURS • WATER IS ABSORBED • VITAMIN K AND B ABSORBED
SOLID WASTE • MATERIALS NOT ABSORBED BY THE INTESTINES • (DEAD BACTERIA, SOME FAT AND PROTEIN, UNDIGESTED FOOD
CONTINUED • ROUGHAGE, DRIED OUT DIGESTIVE JUICES, MUCUS, DISCARDED INTESTINAL CELLS)
THE END OF THE LINE • RECTUM- A SHORT TUBE AT THE END OF THE LARGE INTESTINES • ANUS- OPENING AT THE END OF THE RECTUM
THE END • QUESTIONS ?
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