LIFESCI 2N03 Study Guide - External Anal Sphincter, Sigmoid Colon, Stomach

• School: McMaster University
• Department: Life Sciences
• Course: LIFESCI 2N03
• Professor: Danny M.Pincivero

Document Summary

2 main groups: alimentary canal, gastrointestinal tract, continuous digestive tube through whole body. Function: digestion, breaks food into smaller fragments, absorption, moves the digested fragments from the alimentary canal into the blood. Anatomical structures: mouth (lips, cheeks, palate, tongue, teeth, salivary glands, pharynx, esophagus, stomach (cardiac orifice, fundus, body, pyloric canal, pylorus, pyloric sphincter, omentum, small intestine (duodenum, jejunum, ileum) Large intestine (cecum, ascending colon, transverse colon, descending colon, sigmoid colon, rectum, anal canal) considered to be outside the body (still in external environment: accessory digestive organs teeth, tongue, gallbladder, liver, pancreas. Pincivero, 2013: mechanical digestion, physical preparation of food for absorption chewing, mixing food with enzymes (tongue), churning of food in stomach. Segmentation: mixing of food in intestine with digestive juices smooth muscle contraction and relaxation. Alimentary canal structure: esophagus to anal canal. Four tunics: mucosa, submucosa, muscularis externa, serosa. Moist epithelial layer that lines the lumen of the alimentary canal.