2 How is food digested? Digestion involves: Breaking down of food into smaller piecesThe mixing of foodMovement through the digestive tractChemical breakdown of the large molecules of food into smaller molecules.Question: What are Carbohydrates, proteins and fats broken down or digested into?Answer: Carbohydrates = GlucoseProteins = Amino Acids or AAFats = fatty acids and glycerol
3 Describe the digestive system The digestive tract is a series of hollow organs joined in a tube from the mouth to the anus. Food passes through the digestive tract.Question: Which organs make up the digestive system?Answer:LiverGall bladderPancreasFood does not pass through these organs.
6 Identify and tell the function of each part of the digestive system MouthTeeth bite off and chew food intoa soft pulp that is easy to swallow.Chewing mixes the food with saliva, from salivary glands around the mouth and face, to make it moist and easy to swallow.
7 Identify and tell the function of each part of the digestive system MouthEnzymes in the saliva begin digestion of ?Answer: Carbohydrates, such as an appleFood is chewed up into small pieces called?Answer: Bolus
8 Identify and tell the function of each part of the digestive system EsophagusThe esophagus is a muscular tube. It moves food from the throat and down into the stomach.How long does it take for food to travel to the stomach?Answer: About 5 secondsThe esophagus moves food by waves of muscle contractions called?Answer: Peristalsis
9 Identify and tell the function of each part of the digestive system StomachThe stomach has thick muscles in its wall. These contract to mash the food into a paste called?Answer: ChymeQuestion: What kind of muscle is found in the stomach?Answer: Smooth muscleThe stomach lining produces strong digestive juicesThese create chemical reactions in the stomach, breaking down and dissolving its nutrients.
10 Identify and tell the function of each part of the digestive system StomachQuestion: What is the name of the acidfound in the stomach?Answer: Hydrochloric acid or HCLQuestion: Which chemicals help break fooddown into its nutrients?Answer: Special proteins called ENZYMES
11 Identify and tell the function of each part of the digestive system Small IntestineThis part of the digestive tract is narrow, but very long. How long?Answer: About 20 feetEnzymes continue the chemical reactions on the food.
12 Identify and tell the function of each part of the digestive system Small IntestineThe nutrients are broken down small enough to pass through the lining of the small intestine, and into the blood (diffusion).Question: What is the name ofthe structures where nutrients pass into thebloodstream?Answer: VILLINutrients are carried away to the liver and other body parts to be processed, stored and distributed.
14 Identify and tell the function of each part of the digestive system Pancreas The pancreas, like the stomach, makes digestive juices called enzymes which help to digest food further as it enters the small intestineQuestion: What is the name of the enzyme that helps regulate blood sugar?Answer: INSULIN
15 Identify and tell the function of each part of the digestive system Liver “Love Your Liver”!!!Blood from the small intestineenters the liver, carryingnutrients, vitamins and minerals, and other products from digestion.The liver has at least …………… functionsAnswer: 200
16 Question: Name some of the important jobs of the liver?? Produces bile which breaks down fatConverts glucose to glycogenMake certain amino acidsFilters harmful substances from the blood (such as alcohol and drugs)Stores vitamins and minerals (vitamins A, D, K and B12)Maintains a proper level of glucose in the blood.Is responsible for producing cholesterol.It produces about 80% of the cholesterol in your body.
17 Identify and tell the function of each part of the digestive system Gall BladderA small baglike partunder the liver.It stores a fluid called ………………, which is made in the liver.Answer: BILE
18 Identify and tell the function of each part of the digestive system Gall BladderAs food from a meal enters the small intestine, bile flows from the gall bladder along the bile duct into the small intestine.It helps to digest fatty foods and also contains wastes for removal.
19 Identify and tell the function of each part of the digestive system Large IntestineUseful substances that were not absorbed in the small intestine, such as spare water and body minerals, are absorbed through the walls of the large intestine, back into the blood.Question: What is another name for the largeintestine?Answer: COLON
20 Symptoms of COLON CANCER Abdominal pain and tenderness in the lower abdomen Blood in the stool Diarrhea, constipation, or other change in bowel habits Intestinal obstruction Narrow stools Unexplained anemia Weight loss with no known reason
21 Identify and tell the function of each part of the digestive system Rectum and AnusThe end of the large intestine andthe next part of the tract, the rectum,store the feces.Feces are finally squeezed through a ring of muscle, the anus, and out of the body.
22 Diseases of the Digestive Tract Ulcers – caused by H. pyloriCancer – high fat diets and chemicals in foodIrritable bowel syndrome - ? Stress, dietCrohn’s disease – autoimmune problemCystic fibrosis – hereditary disease, defect in digestive enzymes/proteins for fats
23 For more information about the digestive system, click here: