Digestive System DIGESTIVE SYSTEM
Ingegneria delle tecnologie per la salute Fondamenti di anatomia e istologia aa 2017-18 Digestive system DIGESTIVE SYSTEM After this lesson, you will be able to: • List and describe the functional anatomy of the organs and accessory organs of the digestive system • Discuss the processes and control of ingestion, propulsion, mechanical digestion, chemical digestion, absorption, and defecation • Discuss the roles of the liver, pancreas, and gallbladder in digestion • Compare and contrast the digestion of the three macronutrients Overview of the Digestive System function of DS is to break down the foods, release their nutrients, and absorb those nutrients (small intestine is workhorse of DS) DIGESTIVE SYSTEM digestive system does not work in isolation! DIGESTIVE SYSTEM Digestive System Organs Alimentary Canal Organs Accessory Structures = gastrointestinal (GI) tract or gut = a one-way = aids in breakdown of food : within tube about 7.62 meters (25 feet) in length during mouth, teeth and tongue begin life (10.67 meters (35 feet) after death, once mechanical digestion, whereas salivary smooth muscle tone is lost), beginning at mouth glands begin chemical digestion once and terminating at anus (between those: food products enter small intestine, pharynx, esophagus, stomach, and small and gallbladder, liver, and pancreas release large intestines) to fit functional needs of the secretions (bile + enzymes) essential for body digestion called accessory organs because main function of alimentary canal organs = they sprout from lining cells of nourish the body. developing gut (mucosa) and augment its Both mouth and anus are open to external function (= vital contributions), environment: thus, food and wastes within maintaining a connection to gut by way of alimentary canal are technically considered to ducts, even after complete development be outside the body.
[Show full text]