Digestive_System.txt

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asmalley
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Digestive_System.txt
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2011-12-03 23:51:13
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  1. Where does the alimentary canal begin?
    Oral cavity
  2. What bone does the tongue attach to?
    Hyoid bone
  3. What is the space between the lips and gums called?
    Vestibule
  4. What event do the teeth help with?
    Mastication
  5. What parts if digestion begin in the oral cavity?
    Chemical and mechanical digestion
  6. What covers the tongue and may contain taste buds?
    Papillae
  7. How does the tongue help with mastication?
    Manipulates food, initiates swallowing, and permits enjoyment
  8. Identify locations of the parotid, sublingual, and submandibular glands
    See book
  9. What composes the alimentary canal?
    Mouth, pharynx, esophagus, stomach, small and large intestines
  10. What composes the mucosa?
    Epithelium, lamina propia, and muscularis mucosae
  11. What is the epithelium composed of?
    Simple columnar
  12. What is the lamina propia composed of?
    Areolar connective tissue
  13. What is the muscularis mucosae composed of?
    Smooth muscle
  14. What are the main functions of the mucosa?
    Secretion of enzymes, mucus, hormones, etc.; absorption if digested foodstuffs; and protection against bacterial invasion
  15. What is the submucosa composed if?
    Moderately dense connective tissue containing blood and lymph vessels, lymphoid follicles, and nerve fibers
  16. What is the function of the submicosa?
    Protection and nutrition
  17. What is the muscularis composed of?
    2 layers of smooth muscle. The inner layer runs circular and the outer longitudinal
  18. What does the muscularis do?
    Regulates motility of the GI tract
  19. What composes the serosa?
    Epithelium and connective tissue
  20. What is the outermost layer of the alimentary canal?
    Serosa
  21. What is the innermost layer of the alimentary canal?
    Mucosa
  22. What is the second innermost layer of the alimentary canal?
    Submucosa
  23. What is the 2nd outermost layer of the alimentary canal?
    Muscularis
  24. What does the serosa become outside the abdominopelvic cavity?
    Adventiva
  25. What is another name for the esophagus?
    Gullet
  26. Does the esophagus have any digestive or absorptive function?
    No
  27. What type of muscle exists at the superior and inferior ends of the esophagus?
    Skeletal muscle at the superior end and smooth muscle at the inferior end
  28. What controls food passage into the stomach?
    Gastroesophageal sphincter
  29. What is the role of the fivefold adventiva?
    It anchors organs to surrounding tissues
  30. Is the gastroesophageal sphincter a true sphincter?
    No
  31. What is the site of temporary storage along with chemical and mechanical breakdown of food?
    Stomach
  32. How many layers of muscle are in the stomach?
    3 (oblique, circular, and longitudinal)
  33. What is the area of the stomach that surrounds the office that food enters the stomach?
    Cardiac region
  34. What is the region of the stomach superolateral to the cardiac region?
    Fundus
  35. What is the midportion of the stomach?
    Body
  36. What is the funnel shaped region of the stomach continuous with the small intestines?
    Pyloric region
  37. What is the concave medial surface of the stomach called?
    Lesser curvature
  38. What is the convex lateral surface of the stomach called?
    Greater curvature
  39. What extends from the lesser curvature?
    Lesser omentum (from liver to curvature)
  40. What extends from the greater curvature?
    Greater omentum (which reflects down like an apron over the abdominal contents and attaches to the transverse colon)
  41. What are the folds in the stomach lining?
    Rugae
  42. What does the oblique layer of muscle allow?
    Churning
  43. What do the gastric glands secrete?
    HCl and hydrolytic enzymes
  44. What is the primary enzyme secreted by the stomach?
    Pepsinogen
  45. Where are proteins first broken down and what is responsible?
    The stomach and pepsinogen
  46. Where does most digestive activity occur in the stomach?
    Pyloric region
  47. How does chyme enter the intestines?
    Via the pyloric sphincter (a true sphincter)
  48. What cells are located in gastric glands?
    Chief and parietal cells
  49. What do chief cells secrete?
    Pepsinogen
  50. What do parietal cells secrete?
    HCl and intrinsic factor
  51. What type of epithelium is in the stomach?
    Simple columnar
  52. What are the 3 subdivisions of the small intestines?
    Duodenum, jejunum, and ileum
  53. Location of nearly all nutrient absorption
    Small intestines
  54. What are the hydrolytic enzymes bound to the microvilli of columnar epithelial cells?
    Brush border enzyme
  55. The orifice controlled by the sphincter of Oddi
    Duodenal papilla
  56. The sphincter that allows pancreatic enzymes and bile to enter the duodenum
    Sphincter of Oddi
  57. What are the areas between villi of the intestines?
    Intestinal crypts
  58. Minute projections if the surface plasma membrane of lining cells.
    Microvilli
  59. Finger Ike projections of the mucosa
    Villi
  60. Deep, permanent folds of the mucosa and submucosa they force chyme to spiral throughout the intestines
    Circular folds (plicae circulares)
  61. Scattered mucus producing glands in duodenum
    Brunner's glands
  62. Where does any undigested residue enter the large intestines?
    The ileoceal sphincter
  63. Aggregated lymphoid follicles on small intestines (especially the ileum)
    Peyer's patches
  64. Where is the higher concentration of goblet cells?
    Colon
  65. What are the subdivisions of the large intestines?
    Cecum, vermiform appendix, colon, rectum, and anal canal
  66. What is the vermiform appendix attached to?
    The cesum
  67. What are the divisions of the colon?
    Ascending colon, right colic flexure, transverse colon, left colic flexure, descending colon, and sigmoid colon.
  68. What is the end of the anal canal?
    The anus
  69. How many sphincters does the anus have?
    2, external (voluntary) and internal (involuntary)
  70. What is the longitudinal muscle layer of the muscularis reduced to in the large intestines
    Teniae coli
  71. What causes the formation of the haustra in the large intestines?
    The shortened teniae coli
  72. What are the pocketlike sacs of the large intestines called?
    Haustra
  73. What is the largest gland in the body?
    Liver
  74. What digestive role does the liver play?
    Creates bile
  75. What is the function of bile?
    Emulsifies fats to allow for more efficient lipase activity
  76. Where is bile held when digestive activity is not occurring in the digestive tract?
    Gall bladder
  77. Through what does bile enter the duodenum?
    Exits the liver through the common hepatic duct and enters the duodenum through the bile duct
  78. How does bile get from the liver to the gallbladder?
    Cystic duct
  79. What organ of the digestive system has endocrine and exocrine functions?
    Pancreas
  80. What hormones does the pancreas produce?
    Insulin and glucagon
  81. What type of enzymes does the pancreas produce?
    Hydrolytic
  82. What function does the alkalinity of the pancreatic juice have?
    It neutralizes the acidic chyme from the stomach entering the duodenum
  83. What is the movement that moves food along the digestive system?
    Peristalsis
  84. Identify the arteries and veins aiding the digestive system
    See book
  85. What fan shaped double layer of peritoneum suspends the small intestines?
    Mesentery
  86. What is swallowing formally called?
    Deglutition
  87. What is movement of material along the alimentary canal?
    Propulsion
  88. What is the purpose of physical digestion?
    Reduce bulk, increase surface area, and allows for chemical digestion
  89. What is the purpose of chemical digestion
    Hydrolyze large complex molecules into subunits
  90. What is the transport of digestive end products into the blood or lymph?
    Absorption
  91. What type of epithelium is the esophagus?
    Non-keratinized stratified squamous epithelium
  92. What does the longitudinal smooth muscle of the muscularis externa aid in?
    Peristalsis
  93. What does the circular smooth muscle of the muscularis externa aid in?
    Segmentation (mixing action)
  94. What does saliva contain?
    Segmentation (mixing action)
  95. What part of saliva have protective roles?
    Lysozyme and IgA antibodies
  96. What nerves control the mouth?
    facial and glossopharyngeal
  97. What area of the brain responds to taste and physical contact on the tongue?
    Salivary center in brainstem
  98. What area of the brain responds to smell and anticipation?
    Higher brain centers (cephalic control)
  99. What role does the uvula have?
    Hinges upwards during swallowing to prevent food from entering the nasal cavity.
  100. What muscles contract to push food into the esophagus?
    Pharyngeal muscles
  101. What is reflexive relaxation?
    The upper and lower ends of the esophagus remain tonically contracted unless a bolus approaches
  102. What controls the esophageal and pharyngeals contractions of swallowing?
    Autonomic NS
  103. Where are esophageal glands located?
    In submucosa
  104. What do the esophageal glands do?
    Secrete mucus for lubricaation and protection
  105. What allows food into the stomach?
    Gastroesophageal region (cardiac sphincter)
  106. What is a hital hernia?
    Protrusion of stomach into the thorax through weakeness in the diaphram
  107. What problems does a hiatal hernia propose?
    Increased chance of acid to enter the esophagus and impared swallowing
  108. What layer of the alimentary canal is thicker in the stomach?
    Submucosa (more mucus secreting cells)
  109. Where are extensive gastric pits located?
    Body of the stomach
  110. What are the roles of gastric pits?
    Increased surface mucosa for secretion and absorption
  111. What does H+ do in digestion?
    Activates pespinogen to the active form pepsin
  112. How ar respiration and digestion related?
    H+ are derrived from the same chemical reaction of CO2 and H2O producing carbonic acid which substitutes HCO3- for Cl-
  113. What is the role of mucous surface cells?
    Produce mucous lining
  114. What is the role of mucoous neck cells?
    Produce alkaline mucus to protect lining from acidity
  115. What are the hormone producing cells of the GI tract called?
    Enteroendocrine cells
  116. Which cells compose the enteroendocrine cell group?
    G-Cells, ECL cells, and D-Cells
  117. What hormones are produced by the enteroendocrine cells?
    Gastrin, histamine, endorphines, seratonin, and somatostatin
  118. What do ECL cells do?
    Secrete histamine
  119. What do G cells do?
    Secrete gastrin
  120. What does gastrin do?
    Stimulates ECL and parietal cells
  121. What do D cells do?
    Secrete somatostatin
  122. What does somatostatin do?
    Inhibits ECL and parietal cells
  123. What are ways the stomach prevents itself from its acid?
    Tight junctions of mucosal lining cells, alkaline mucous secreted, and constant exfoliation of lining cells.
  124. What is absorbed in the stomach?
    Water, electrolytes, monosaccharides, fat soluble molecules (like alcohol)
  125. What causes peptic ulcers?
    Not protected portions of the stomach lining
  126. Where is the greatest porportion of ulcers?
    In the duodenum
  127. What is associated with ulcers?
    H. Pylori
  128. Where does positive stimulus for the stomach come from?
    Parsympathetic division via vagus nerve
  129. When does the gastric phase begin?
    With direct response to contact of food in the stomach via pressoreceptors
  130. What is retropulsion?
    When chyme surges backwards only to be pushed forward again into the pylorus
  131. What happens in the gastric phase?
    ACh and histamine are released, chyme surges forward, retropulsion, and release of gastrin into blood due to chyme in the pylorus
  132. What causes increased churning and pressure in the stomach?
    Presence of chyme in the pylorus
  133. When does the intestinal phase start?
    When chyme enters the duodenum
  134. What happens in the intestinal phase?
    G cells secrete gastrin (start signal), gastric inhibitory peptide (GIP) secreted (stop signal)
  135. What inhibits gastrine secretion?
    Decreased ph
  136. What does Gastric inhibitory peptide (GIP) do?
    Inhibits stomach secretion and motility to give the duodenum more time to procede before more chyme comes in
  137. What is the enterogastric reflux?
    Decreased motility and forcefully closes the pyloric sphincter
  138. Where is the site of most digestive enzyme release and the start of intensive digestion?
    Duodenum
  139. What timulates the release of CCK into the blood?
    Presence of fatty chyme in the duodenum
  140. What does CCK do?
    Inhibits stomach, stimulates the release of enzymes by the pancreas, and stimulates contraction of the gall bladder to release bile
  141. What does secretin do?
    Decreases acid secretion by stimulating the pancrease to release bicarbonate
  142. What controls passes out of the pancreas through the hepatopancreatic ampulla?
    Sphincter of Oddi
  143. What do the pancreatic duct and common bile duct become?
    Hepatopancreatic ampulla
  144. What makes up pancreatic juice?
    Lipase, Tyyrpsin, chymotrypsin, carboxypeptidase, bicaronate, and amylase
  145. What does lipase do?
    Splits emulsified fats into glycerol and fatty acids
  146. What do trypsin and chymotrypsin do?
    Breaks polypeptides into dipeptides
  147. What does carboxypeptidase do?
    Splits dipeptides into amino acids
  148. What does bicarbonate do?
    Neutralizes acid to pH 8 (level needed for activity of protease activity)
  149. What does amylase do?
    Cleaves polysaccharides into shorter chains and disaccharides
  150. What are some intestinal enzymes (Brush Border enzymes)?
    Aminopeptidase, carboxypeptidase, sucrase, lactase, maltase, and enterokinase
  151. What do aminopeptidase and carboxypeptidase do?
    Split dipeptides into amino acids
  152. What do sucrase, maltase, and lactase do?
    Split disaccharides into monosaccharides
  153. What does enterokinase do?
    activates trypsinogen into trypsin (which activates chymotrypsin and carboxypeptidase)
  154. What in the small intestines increases surface area?
    Circular folds, villi, and microvilli
  155. What is the source of secretory cells of the mucosa in the intestines?
    Intestinal crypts
  156. What role does the muscularis mucosae have in the small intestines?
    Contracts to move villi and increase exposure to contents
  157. What is the function of the colon?
    Absorption of remaining water and production of feces
  158. When does the ilececal sphincter relax?
    WHen peristalsis arrives from the ileum
  159. What is haustral churning caused by?
    Segmentation contractions
  160. What is mass peristalsis?
    Large movements which occur at intervals
  161. What is mass peristalsis initiated by?
    Gastrocolic reflex
  162. What is the gastrocolic reflex?
    Stimulation of the colon due to food entering the stomach
  163. What vitamins are produced during mass peristalis?
    Vitamin K and B
  164. What is the defecation reflex?
    Involuntary relaxation of the internal anal sphincter due to mass movement then voluntary relaxation of the external anal sphincter
  165. How are monosaccharides and amino acids absorbed?
    Active co-transport
  166. How are large molecules absorbed?
    endocytosis
  167. How ar fatty acids and fat-soluble molecules absorbed?
    Aggregated into micelles and diffuse into phospholipid matrix of mucosal lining cells
  168. What is the manufacturing function of the liver?
    Manufature of blood proteins, urea, and bile
  169. What does the liver store?
    Glycogen, iron, and fatu soluble vitamins A,D,E, and K
  170. Detoxification is carried out by what organ?
    Liver
  171. The liver metabolizes proteins through what processes?
    Transamination and deamination
  172. What processes does the liver control in reguards to glycogen?
    Glycogenesis (glucose to glycogen), glycogenolysis (Glycogen to glucose), gluconeogenesis (non-carb source to glucose)
  173. What are the absorptive phases of glycemic regulation?
    Glycogenesis, protein manufacture, and lipogenesis
  174. What are the stages of the post-absorptive phase of glycemic regulation?
    Glycogenolysis, lipolysis, and gluconeogenesis
  175. What are some hormones important to nutrient processing?
    Insulin, glucagon, epinephrine, and cortisol

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