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A&P II Chapter 26 SG
GI Study Guide
| Question | Answer |
|---|---|
| Which type of epithelium lines most of the mucosa of the GI tract | Simple columnar |
| Why are a few areas lined with stratified squamous epithelium? | To withstand abrasion |
| Which of the three types of muscle forms the muscular is layer of the GI tract? | Smooth muscle |
| What happens tWhat are the two layers of the peritoneum? | Parietal and visceral |
| Which layer of the peritoneum forms the mesentery? | Visceral |
| What is the function of the mesentery? | Supports the GI tract muscles |
| Where is the greater momentum found? | Extends off of the stomach and covers most of the abdominal organs |
| What does the greater momentum store? | Adipose tissue |
| What are the two types of receptors in the GI tract? | Mechano and chemo |
| What do mechanoreceptors detect? | Stretch |
| List the three pairs of salivary glands: | Parotid, submandibular, sublingual |
| What digestive enzyme is found in saliva? | Salivary amylase |
| What is the action of salivary amylase? | Breakdown of all of the starches |
| Describe the pharynx: | A funnel shaped muscular passageway for food |
| Is the pharynx composed of skeletal or smooth muscle? | Skeletal |
| What are the two sphincters of the esophagus? | Superior and inferior |
| What is deglutition? | Swallowing |
| What structure blocks the opening of the nasopharynx when swallowing? | Uvula and soft palate |
| What blocks the larynx during swallowing? | Epiglottis |
| What is the bite of food called after swallowing? | Bolus |
| What are the four regions of the stomach? | Cardiac region, fundus, body, pylorus |
| Where are the gastric glands of the stomach found? | Deep in the mucosa of the gastric pits |
| How many different secretory cells are found in the gastric glands? | Five |
| What product do surface mucous cells produce? | Alkaline mucin |
| Why is the mucin alkaline? | To prevent ulceration |
| What product do mucous neck cells produce? | Acidic mucin |
| What product to parietal cells produce? | Hydrochloric acid |
| What are two functions of HCl in the stomach? | Kills microorganisms, and breaks down ingested tissue |
| What product do chief cells produce? | Inactive zymogen granules |
| What product do g-cells produce? | Gastrin |
| What is the bolus turned into in the stomach? | Chyme |
| What are the three sections of the small intestine? | Duodenum, jejunum, ileum |
| What are the two accessory organs of digestion? | Liver and pancreas |
| Where does the small intestine begin? | Duodenum |
| Where does the small intestine end? | Ileum |
| What is the function of the villi in the small intestine? | Increase surface area for absorption and secretion |
| What is the function of lacteals? | Absorption of lipids and lipid-soluble vitamins |
| What are microvilli | Extensions of the plasma membrane of simple columnar epithelial cells that increase surface area |
| What is the function of bile? | Digests lipids |
| Which organ synthesizes bile? | Liver |
| Where is bile stored? | Gallbladder |
| What structure connects to the small intestine to allow the entry of bile? | Common bile duct |
| What are the three general types of digestive enzymes produced by the pancreas? | Pancreatic amylase, lipase, and proteases |
| Where do pancreatic enzymes enter the small intestine? | Hepatopancreatic ampulla |
| Where does the lg intestine begin? | Cecum |
| Where does the lg intestine end? | Rectum |
| What are the three sections of the large intestine? | Cecum, colon, rectum |
| What structure is found at the cecum? | Appendix |
| Which carbohydrate macromolecule can humans digest? | Starch |
| Where does most protein digestion occur? | Sm intesting |
| Where does most lipid digestion occur? | Sm intestine |
| What substance converts lipids into micelle? | Bile salts |