Presentation on theme: "THE DIGESTIVE SYSTEM. Q #1 Digestion begins in the oral cavity. Process called digestion occurs as food is broken down both chemically and mechanically."— Presentation transcript:
Q #1 Digestion begins in the oral cavity. Process called digestion occurs as food is broken down both chemically and mechanically. Broken down foods must be absorbed into the blood stream. Undigested food remains are removed, or excreted, from the body in feces.
Organs forming the continuous tube from the mouth to the anus are collectively called the gastrointestinal tract. Organs outside of the digestive tract proper (food does not travel through) and secrete their products into the digestive tract are called accessory digestive system organs.
Q #13 Functions of Digestive System 1.eating 2.swallowing, segmentation and propulsion 3.chewing, churning 4.enzymatic breakdown 5.transport of nutrients from lumen to blood 6.elimination of feces
Diseases and Disorders – Q #15 Appendicitis – inflammation and infection of the appendix Constipation – inability to pass feces Diarrhea – passage of watery stools Gallstones – associated with prolonged storage of bile in the gallbladder; causes severe epigastric/abdominal pain
Heartburn – GERD (gastroesophageal reflux disorder); results from reflux of acidic gastric liquids into the esophagus Jaundice – yellowing of eyes and skin; indicates liver problems or blockage of the biliary ducts Peritonitis – inflammation of the abdominal membrane Ulcer – erosion of the stomach or duodenal mucosa
Nutrition and Metabolism – Q #20 Amino acids Tend to be conserved by cells Used to make the bulk of cell structure and enzymes Carbohydrates Most used substance for producing ATP Fats In myelin sheaths and cell membranes Second most important energy source Insulates organs