Bile Composition and Function Quiz
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Questions and Answers

What stimulates parietal and chief cells in the stomach?

  • Somatostatin released from the small intestine
  • Acetylcholine released from enteric nerve endings (correct)
  • Gastrin released from the stomach
  • Gastrin released from the pancreas

What primarily activates gastric secretion during the cephalic phase?

  • Distension of the small intestine
  • Vagal input (correct)
  • Gastrin release
  • Presence of the meal

What is a key mechanism that terminates gastric secretion after a meal moves to the small intestine?

  • Activation of stretch receptors in the stomach
  • Buffering of gastric acidity by meal constituents (correct)
  • Physical presence of the meal
  • Release of somatostatin

What provides energy to drive the proton pump in gastric parietal cells?

<p>Mitochondria (C)</p> Signup and view all the answers

What is released into the bloodstream alongside protons during gastric secretion?

<p>Bicarbonate ions (C)</p> Signup and view all the answers

What is of major importance in digestion in pancreatic juice?

<p>Enzymes (A)</p> Signup and view all the answers

Which hormone is responsible for stimulating pancreatic enzyme secretion?

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

What is the main action of cholecystokinin (CCK) in relation to the gallbladder?

<p>Contraction of the gallbladder (B)</p> Signup and view all the answers

Which effect does cholecystokinin (CCK) have on gastric emptying?

<p>Inhibits gastric emptying (D)</p> Signup and view all the answers

Where are endocrine cells known as I cells located?

<p>Upper small intestine mucosa (B)</p> Signup and view all the answers

What stimulates the secretion of cholecystokinin (CCK)?

<p>Contact of intestinal mucosa with digestion products (C)</p> Signup and view all the answers

What is one of the locations where CCK is found, apart from I cells in the upper small intestine?

<p>Brain (C)</p> Signup and view all the answers

What is the primary role of gastric secretion in the stomach?

<p>To protect the stomach from self-digestion (D)</p> Signup and view all the answers

Which type of cells in the stomach secrete hydrochloric acid and intrinsic factor?

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

What is the precursor of pepsin, an enzyme that initiates protein digestion?

<p>Pepsinogen (A)</p> Signup and view all the answers

Which hormone released by G cells in the antrum of the stomach triggers gastric secretion?

<p>Gastrin (D)</p> Signup and view all the answers

What is the main function of intrinsic factor secreted by parietal cells?

<p>Absorbing vitamin B12 (C)</p> Signup and view all the answers

Which stimulus triggers parietal cell secretion in the stomach?

<p>Histamine (C)</p> Signup and view all the answers

What is the main function of bile in the body?

<p>To dispose of cholesterol (A)</p> Signup and view all the answers

Which component gives bile the golden yellow color?

<p>Glucuronides of bile pigments (C)</p> Signup and view all the answers

What are the main components of bile when considering it as a digestive secretion?

<p>Bile acids (C)</p> Signup and view all the answers

How are bile acids synthesized?

<p>From cholesterol (D)</p> Signup and view all the answers

What is responsible for the regulation of gastrointestinal functions after a meal?

<p>Endocrine regulation (C)</p> Signup and view all the answers

What is the enterohepatic circulation related to in the text?

<p>Bile production (A)</p> Signup and view all the answers

What is the role of ghrelin in the gastrointestinal system?

<p>Stimulates growth hormone secretion (C)</p> Signup and view all the answers

Which peptide is involved in increasing the motility of the small intestine?

<p>Substance P (B)</p> Signup and view all the answers

What is the function of the myenteric plexus in the gastrointestinal tract?

<p>Motor control of smooth muscle layers (D)</p> Signup and view all the answers

How does the enteric nervous system connect to the central nervous system?

<p>Via parasympathetic and sympathetic fibers (B)</p> Signup and view all the answers

Which component of the gastrointestinal tract is referred to as the 'little brain'?

<p>Myenteric plexus (C)</p> Signup and view all the answers

What effect does substance P have on the gastrointestinal tract?

<p>Increases the motility of the small intestine (A)</p> Signup and view all the answers

What is the primary function of the gastrointestinal tract?

<p>Facilitate the absorption of nutrients and water into the body (B)</p> Signup and view all the answers

Which gland produces saliva for initial digestion of starch?

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

What is the composition of saliva mostly controlled by?

<p>Parasympathetic branch of the autonomic nervous system (D)</p> Signup and view all the answers

How does the sympathetic branch of the autonomic nervous system influence saliva composition?

<p>By decreasing proteinaceous content (A)</p> Signup and view all the answers

What is the function of saliva in the oral cavity?

<p>Initiate digestion of starch (A)</p> Signup and view all the answers

What is the pH nature of saliva in comparison to plasma?

<p>Alkaline (D)</p> Signup and view all the answers

Which organ secretes substances that aid in digestion along the length of the intestine?

<p>Pancreas (B)</p> Signup and view all the answers

What is the significance of the substantial surface area of the intestine?

<p>It enhances absorptive function (A)</p> Signup and view all the answers

Which phase of secretion in the stomach is quantitatively the most significant according to the text?

<p>Gastric phase (C)</p> Signup and view all the answers

What is one of the main functions of saliva as mentioned in the text?

<p>Facilitating swallowing (C)</p> Signup and view all the answers

How is the release of pancreatic enzymes controlled?

<p>By hormonal control (B)</p> Signup and view all the answers

What predominantly activates gastric secretion during the cephalic phase?

<p>Vagal input (B)</p> Signup and view all the answers

Why are most digestive enzymes in pancreatic juice released in inactive forms?

<p>To avoid damage to the pancreas (B)</p> Signup and view all the answers

What type of cells are packed with mitochondria to supply energy for the proton pump in the stomach?

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

Which mechanism terminates gastric secretion after a meal moves from the stomach into the small intestine?

<p>Somatostatin release (B)</p> Signup and view all the answers

What is the significance of trypsin inhibitor in pancreatic secretion?

<p>It prevents activation of trypsinogen (A)</p> Signup and view all the answers

What is released into the bloodstream alongside protons during gastric secretion?

<p>Bicarbonate ions (C)</p> Signup and view all the answers

Which gastrointestinal secretion contributes to the digestion and absorption of fats?

<p>Bile (B)</p> Signup and view all the answers

How do granules containing digestive enzymes exit the cells in the pancreas?

<p>By exocytosis (D)</p> Signup and view all the answers

Which gastric phase reflex further amplifies secretion during digestion?

<p>'Vago-vagal' reflexes (B)</p> Signup and view all the answers

What effect does increased acid secretion have on further gastrin secretion?

<p>Inhibits further secretion of gastrin (A)</p> Signup and view all the answers

Where are endocrine cells known as I cells primarily located?

<p>Mucosa of upper small intestine (C)</p> Signup and view all the answers

How does ghrelin primarily influence growth hormone secretion?

<p>By acting on receptors in the pituitary gland (D)</p> Signup and view all the answers

Where are sensory neurons, interneurons, and motor neurons primarily located in relation to the gastrointestinal tract?

<p>In the enteric nervous system (D)</p> Signup and view all the answers

What does ghrelin primarily stimulate when it acts directly on receptors in the pituitary gland?

<p>Growth hormone secretion (A)</p> Signup and view all the answers

What is one of the strategic roles of ghrelin in the gastrointestinal system?

<p>Regulation of food intake through central control (C)</p> Signup and view all the answers

What is the primary role of the myenteric plexus in the gastrointestinal tract?

<p>Innervation of smooth muscle layers (D)</p> Signup and view all the answers

Which nerve fiber network is located between the outer longitudinal and middle circular muscle layers in the gastrointestinal tract?

<p>Myenteric plexus (C)</p> Signup and view all the answers

How many major networks of nerve fibers are intrinsic to the gastrointestinal tract based on the text?

<p>Two (C)</p> Signup and view all the answers

Which hormone is primarily secreted by the stomach and influences the central control of food intake?

<p>Ghrelin (C)</p> Signup and view all the answers

What is the approximate number of neurons in the enteric nervous system compared to those in the whole human spinal cord?

<p>Equal (A)</p> Signup and view all the answers

What is the trophic effect of CCK on the pancreas?

<p>Enhances pancreas growth and maintenance (A)</p> Signup and view all the answers

In addition to I cells, where else is CCK found in the body?

<p>Distal ileum and colon (A)</p> Signup and view all the answers

What triggers the increased secretion of CCK according to the text?

<p>Contact of intestinal mucosa with digested peptides and amino acids (A)</p> Signup and view all the answers

What is the primary effect of the peptide substance P in the gastrointestinal tract?

<p>Increases small intestine motility (A)</p> Signup and view all the answers

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