BIO 322 - Digestive System Review Questions and Answers

Digestion definition The process of consuming and processing the food we eat in order to sustain life 4 basic processes of digestive system Ingestion, digestion, absorption, defecation Ingestion selective intake of food Digestion mechanical and chemical breakdown of food into molecules that can be absorbed and used for energy Absorption Uptake of nutrients into the bloodstream Defecation Elimination of the un-useable leftovers Mechanical digestion Physical breakdown of large pieces of food into smaller pieces Chemical digestion Process by which enzymes break down food into small molecules that the body can use Digestive tract tube that begins at the mouth and ends at the anus ___________ movements move food along the digestive tract Propulsive Accessory organs Structures which assist in mechanical and chemical digestion accessory organs examples teeth, tongue, salivary glands, liver, gallbladder, pancreas Secretions are deposited _______ the digestive tract Into 4 main layers of the digestive tract? mucosa, submucosa, muscularis externa, serosa Mucosa consists of epithelium, lamina propria, muscularis mucosae Epithelium Type varies as you move down the tract stratified squamous is in the Oral cavity, esophagus, anal canal