Fun Facts on Digestion • Stomach growling??? – Intestines contracting. • Burping or a “little flatulence”??? – trapped gas and air from bacteria. • Every person eats @3lbs of food / day – 1095 lbs of food / year!!!!! • Entire digestive system is 30 ft long!!! • You produce 1 qt of saliva / day!!!
“Chewing your cud” – How many stomachs does a cow have???? • 4 !!!! What organ is attached to your large intestines and has no known purpose??? Your appendix
Digestive System Digestion – the chemical and mechanical breaking down of food into something the cells can use. Kidshealth
Major Organs & Functions • Mouth • Esophagus • Stomach • Small Intestines • Large Intestines / colon • Rectum & Anus • Liver • Gall Bladder • Pancreas
Mouth–Beginning of digestion. • Mechanical Digestionbegins with tongue and teeth. MOST mechanical digestion takes place here. • Chemical Digestionbegins with saliva breaking down starch to sugar. Saltine Crackers
Epiglottis • flap of cartilage • closes trachea (windpipe) when swallowing • food travels down esophagus • Peristalsis • involuntary muscle contractions to move food along
Esophagus-carries chewed food to the stomach. *Peristalsis – muscle contractions that push the food down the tube. stomach-secrete HCl (hydrochloric acid) & pepsin to help with chemical digestion. Mechanical digestion also takes place here with the churning.
Liver- have over 500 functions!!! - produces bile to help digestion fat. gall bladder - storage tank for the bile. Pancreas- secretes enzymes to help break down food in the sm. intestines
smallintestine- Food enters here AFTER the stomach. MOST of the chemical digestion takes place / the pancreas and gall bladder secrete chemicals Nutrients are absorbed here into your blood.
large intestines / colon. Water is absorbed here & enters the bloodstream. The remaining is prepared to leave the body as waste. rectumand anus– a short tube and opening where solid waste is stored and eliminated from the body. • http://www.harcourtschool.com/activity/digest/
Which type of digestion is the following? • Chewing a saltine? - 2. Saliva breaking the saltine down into molecules of glucose? - 3. Your tongue breaking pieces of a hamburger apart? 4. Pepsin (an enzyme) & HCl in your stomach breaking the hamburger into amino acids? Mechanical Chemical Mechanical Chemical