Lab_Ex38-39_HW - Melissa Pomeroy Salti AP III Lab HW

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Melissa Pomeroy Salti – AP III Lab HW Exercise 38 Homework - Anatomy of Digestive System  What are the parts of the gastrointestinal tract? - mouth - pharynx - esophagus - stomach - small and large intestine What is the function of the digestive system? - Ingestion - Mechanical processing - Digestion - Secretion - Absorption - Excretion Name the accessory organs/structures. - Teeth - Tongue - Salivary glands - Gallbladder - Liver - Pancreas What is the definition of digestion? Ingested food is broken down mechanically and chemically into smaller diffusible molecules. What is the definition of absorption? Digested end-products diffuse through the epithelial cells lining parts of the GI tract and into the blood for distribution to the body cells. Name the 4 tunics of the alimentary canal 1) Mucosa 2) Submucosa 3) Muscularis externae 4) Serosa (visceral peritoneum) or Adventitia What is the function of the mucosa - Secretion (of enzymes, mucus and hormones) - Absorption - Protection (against bacterial invasion or digestive juices) The mucosa consist of 3 layers, mention them and describe each layer:
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Melissa Pomeroy Salti – AP III Lab HW - Epithelium - Lamina propria - Muscularis mucosae   The submucosa consist of:  - Blood and lymphatic vessels - Scattered lymph follicles - Nerve fibers (submucosal plexus) In the muscularis externa the circular layer is what to the longitudinal layer?  The circular layer of the muscularis externa is deep to the longitudinal layer. What is the name and the function of the nerve plexus you will find in the muscularis  externa? In the muscularis externa, the myenteric plexus innervates the smooth muscles responsible for GI motility. What is the serosa? The serosa is the outermost covering of the GI tract – also called the visceral peritoneum. Where do you find the serosa? The serosa covers organs in the peritoneal cavity.
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This note was uploaded on 05/29/2011 for the course BIO 233 taught by Professor Salti during the Spring '11 term at Portland CC.

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Lab_Ex38-39_HW - Melissa Pomeroy Salti AP III Lab HW

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