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Digestion: mechanical and chemical breakdown of food. Absorption: passage of digested products from GI tract into blood and lymph. Defecation: elimination of feces from GI tract. The organs of digestive system.
The activities of the digestive system are regulated by both hormones and neural reflexes. HORMONES • The physical presence of food in the lower region of the stomach stimulates the endocrine cells within then stomach wall to release the protein hormone “gastrin”. • Gastrin is released into the blood and travels back to the heart and
General characteristics of the digestive system. 1. The GI tract is over 20 feet long, specialized in. mechanical and chemical digestion, absorption, and elimination. 2. Accessory structures are mainly involved in. secreting digestive enzymes and digestive fluids. 3. the GI tract is composed of 4 layers of tissue:
Main Functions of Digestive System • 4 major activities of GI tract 1. Motility • Propel ingested food from mouth toward rectum 2. Secretion of juices e.g. saliva • Aid in digestion and absorption 3. Digestion • Food broken down into absorbable molecules 4. Absorption • Nutrients, electrolytes, and water are absorbed or transported from
Human Digestive System Anatomy Objectives: 1. Learn the anatomy of the digestive system. You should be able to find all terms in bold on the human torso models. 2. Relate structure of the system to some of its functions. I. Introduction: Some terms used to describe the relative positions of body parts are used
It is fairly common to discuss the digestive system in three segments: a) The oral cavity (including teeth and tongue) and the pharynx. b) The digestive tube (or alimentary canal, or gastrointestinal tract) including esophagus, stomach, small intestine, and large intestine.
The Gastrointestinal System is responsible for the breakdown and absorption of various foods and liquids needed to sustain life. Many different organs have essential roles in the digestion of food, from the mechanical disrupting by the teeth to the creation of bile (an emulsifier) by the liver.
