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DIGESTION NOTES http://www.brainpop.com/health/bodysystems/digestivesystem/ 7th grade science STRUCTURE OF THE DIGESTIVE SYSTEM • • • • • • • • • MOUTH ESOPHAGUS STOMACH SMALL INTESTINE LIVER PANCREAS GALLBLADDER LARGE INTESTINE RECTUM WHAT IS THE FUNCTION OF DIGESTION? • BREAKS DOWN FOOD INTO MOLECULES THE BODY CAN USE. • MOLECULES ARE ABSORBED INTO BLOOD AND CARRIED THROUGHOUT BODY. • WASTES ARE ELIMINATED. MECHANICAL DIGESTION • THE PHYSICAL PROCESS THAT TEARS, GRINDS AND MASHES LARGE FOOD PARTICLES INTO SMALLER PIECES. CHEMICAL DIGESTION • THE PROCESS THAT BREAKS LARGE FOOD MOLECULES INTO SMALLER MOLECULES USING ENZYMES. 1.MOUTH • BREAKS DOWN STARCH INTO SUGAR • TEETH AND TONGUE ARE IMPORTANT IN MECHANICAL DIGESTION. • SALIVARY GLANDS IMPORTANT IN CHEMICAL DIGESTION. SALIVA • THE FLUID RELEASED WHEN YOUR MOUTH WATERS. EPIGLOTTIS • Covers up the trachea when you swallow so that nothing but air enters. • Allows food to go down the esophagus 2.ESOPHAGUS • A MUSCULAR TUBE THAT CONNECTS THE MOUTH TO THE STOMACH LINED WITH MUCUS TO ALLOW FOOD TO BE MOVED ALONG PERISTALSIS • CONTRACTIONS OF ESOPHAGUS THAT PUSHES ALONG FOOD. 3.STOMACH • A J-SHAPED MUSCULAR POUCH • MOST MECHANICAL DIGESTION OCCURS HERE • CHURNS THE FOOD INTO A THICK, SOUPY LIQUID. • PEPSIN CHEMICALLY DIGESTS PROTEINS INTO AMINO ACIDS. • HYDROCHLORIC ACID KILLS BACTERIA. 4.SMALL INTESTINES • THE PART WHERE MOST CHEMICAL DIGESTION AND ABSORPTION OCCURS HERE. • SECRETIONS FROM THE LIVER, PANCREAS AND SMALL INTESTINE BREAK FOOD INTO SIMPLE SUGARS AND AMINO ACIDS. VILLI • FINGERLIKE PROJECTIONS THAT INCREASE THE SURFACE AREA OF THE SMALL INTESTINES. THESE ABSORB NUTRIENTS. LIVER • THE LARGEST AND HEAVIEST ORGAN INSIDE THE BODY; IT BREAKS DOWN SUBSTANCES AND ELIMINATES NITROGEN FROM THE BODY. • (PRODUCES BILE) BILE • A SUBSTANCE THAT BREAKS UP FAT PARTICLES INTO SMALLER ONES. PANCREAS • PRODUCE ENZYMES THAT BREAK DOWN STARCHES, PROTEINS AND FATS ( TRIANGULAR ORGAN) 5.LARGE INTESTINES • THE LAST SECTION OF THE DIGESTIVE SYSTEM WHERE WATER IS ABSORBED FROM FOOD AND THE REMAINING MATERIALS IS ELIMINATED FROM THE BODY • LARGE INTESTINES CONTAIN BACTERIA THAT PRODUCE VITAMINS. THE END • RECTUM – A SHORT SECTION AT THE END OF THE LARGE INTESTINE WHERE WASTE MATERIAL IS COMPRESSED INTO A SOLID FORM BEFORE BEING ELIMINATED. • ANUS –THE OPENING AT THE END OF THE DIGESTIVE SYSTEM THROUGH WHICH WASTES ARE ELIMINATED. KEEP YOUR DIGESTIVE SYSTEM HEALTHY • Drinking water and eating a healthy diet • Eat foods rich in fiber (fruits, vegetables, and whole grains)