4.3
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Questions and Answers

What is the primary function of mucus secreted by the alimentary tract? TWO ANSWERS

  • To provide a protective barrier against acid and enzymes (correct)
  • To lubricate the passage of food
  • To facilitate absorption of nutrients
  • To neutralize stomach acid
  • Which hormone is primarily responsible for stimulating gastric acid secretion?

  • Secretin
  • Cholecystokinin (CCK)
  • Gastrin (correct)
  • Somatostatin
  • What is the primary function of the exocrine pancreas?

  • To absorb nutrients
  • To produce insulin
  • To secrete digestive enzymes (correct)
  • To secrete bile
  • Which of the following is NOT a component of bile secreted by the liver?

    <p>Pepsin</p> Signup and view all the answers

    What is the function of the tiny projections called villi and microvilli found on the folds of the small intestine?

    <p>Increase the total area for absorption</p> Signup and view all the answers

    What is the primary function of the small intestine secretions?

    <p>To facilitate digestion</p> Signup and view all the answers

    What is the composition of mucus secreted by mucous glands onto the gut wall? TWO ANSWERS

    <p>Made up of large polysaccharides and small quantities of protein</p> Signup and view all the answers

    Which is true about mucus and the gut wall?

    <p>Adheres tightly to surfaces as a thin film</p> Signup and view all the answers

    Which condition is associated with a lack of intrinsic factor, leading to pernicious anemia?

    <p>Atrophic gastritis</p> Signup and view all the answers

    What is the role of blood capillaries and lacteals in the small intestine?

    <p>Move absorbed nutrients into circulation</p> Signup and view all the answers

    How does mucus resist digestion by GI enzymes?

    <p>Buffers pH in the gastrointestinal tract</p> Signup and view all the answers

    What are the two main secretions in the alimentary tract?

    <p>Digestive enzymes and mucus</p> Signup and view all the answers

    Which glands secrete acid and pepsinogen in the stomach?

    <p>Parietal cells</p> Signup and view all the answers

    What type of stimulation greatly increases glandular secretions in the alimentary tract?

    <p>Parasympathetic stimulation</p> Signup and view all the answers

    How do GI hormones regulate the volume and composition of secretions?

    <p>By influencing the chemical environment in the GI lumen</p> Signup and view all the answers

    How are GI hormones released into the body?

    <p>Secreted into capillary blood or diffuse locally to target cells</p> Signup and view all the answers

    What triggers exocytosis of glandular cell contents to the exterior?

    <p>Permeability increase to calcium ions</p> Signup and view all the answers

    What is the primary function of the serous secretion in saliva?

    <p>To digest starches via the enzyme ptyalin</p> Signup and view all the answers

    Which salivary gland produces only serous secretion?

    <p>Parotid gland</p> Signup and view all the answers

    What is the primary function of the mucus secretion in saliva?

    <p>To provide lubrication and protection</p> Signup and view all the answers

    Which nerve stimulates the parotid gland to secrete saliva?

    <p>Glossopharyngeal nerve (CN IX)</p> Signup and view all the answers

    What is the primary function of the esophageal secretions?

    <p>To lubricate the esophagus for swallowing</p> Signup and view all the answers

    Which of the following inhibits saliva secretion?

    <p>Both A and B</p> Signup and view all the answers

    Which enzyme is responsible for hydrolyzing fat for digestion?

    <p>Cholesterol esterase</p> Signup and view all the answers

    What is the main function of the brush border enzyme enterokinase (enteropeptidase) in the pancreas?

    <p>Activate pancreatic zymogens</p> Signup and view all the answers

    Which hormone controls the secretion of pancreatic enzymes when food enters the small intestine?

    <p>Cholecystokinin (CCK)</p> Signup and view all the answers

    What is the primary function of the biliary tree in the digestive system?

    <p>Regulate entry of bile and pancreatic secretions</p> Signup and view all the answers

    Which enzyme prevents the activation of other pancreatic zymogens in the acinar cells?

    <p>Trypsin inhibitor</p> Signup and view all the answers

    In what part of the digestive system does secretin stimulate the secretion of bicarbonate ions from pancreas?

    <p>Duodenum</p> Signup and view all the answers

    What is the primary role of acetylcholine in regulating pancreatic secretion?

    <p>Release of digestive enzymes</p> Signup and view all the answers

    Which structure surrounds the duct where combined bile and pancreatic secretions enter the duodenum?

    <p>(Oddi) Hepatopancreatic Sphincter</p> Signup and view all the answers

    'Alkaline tide' refers to a phenomenon that occurs due to the neutralization of which substance?

    <p>Hydrochloric acid</p> Signup and view all the answers

    The liver produces between 500-1000 ml of bile per day.

    <p>True</p> Signup and view all the answers

    Bile acids are enzymes that help in the digestion of fats.

    <p>False</p> Signup and view all the answers

    The primary bile acids formed in the liver are cholic acid and chenodeoxycholic acid.

    <p>True</p> Signup and view all the answers

    In the enterohepatic circulation, 20% of bile salts are absorbed from the small intestine.

    <p>False</p> Signup and view all the answers

    Bile secretion occurs in a single stage.

    <p>False</p> Signup and view all the answers

    The hormone cholecystokinin (CCK) stimulates the gallbladder to contract and release bile, especially with fatty foods.

    <p>True</p> Signup and view all the answers

    Bile salts are formed in the gallbladder from cholesterol.

    <p>False</p> Signup and view all the answers

    Gallstones can form due to inflammation of the gallbladder epithelium, which changes the absorption of water and bile salts.

    <p>True</p> Signup and view all the answers

    The hormone secretin stimulates the secretion of hydrochloric acid from the liver.

    <p>False</p> Signup and view all the answers

    Bile serves as a means of excretion for bilirubin and excess cholesterol.

    <p>True</p> Signup and view all the answers

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