Regulation of Gastric Secretion: Gastrin and HCl Release
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Questions and Answers

What is the function of the upper esophageal sphincter during swallowing?

  • Forces food into the stomach
  • Contracts after food enters (correct)
  • Relaxes after food enters
  • Contracts before food enters

During swallowing, what is the role of the constrictor muscles in the pharynx?

  • Contract after food enters the esophagus
  • Force food into the esophagus (correct)
  • Contract before food enters
  • Relax after food enters

What is the function of the gastroesophageal sphincter after food enters the stomach?

  • Opens to allow food back into the esophagus
  • Forces food into the intestines
  • Contracts to stop peristalsis
  • Closes to prevent regurgitation (correct)

What is the role of peristalsis in digestion?

<p>Moves food through the esophagus to the stomach (B)</p> Signup and view all the answers

Where is the fundus located in the stomach?

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

What is the function of the pyloric valve in stomach emptying?

<p>Controls stomach emptying (C)</p> Signup and view all the answers

What initiates the release of HCl from parietal cells during the gastric phase?

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

What causes a decline in pH, leading to inhibition of gastrin secretion?

<p>Low pH (below 2) (D)</p> Signup and view all the answers

During the intestinal phase, what factor briefly stimulates the gastric glands of the stomach?

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

Which of the following is NOT a factor that causes inhibition of gastric secretions during the intestinal phase?

<p>Increased gastrin levels (A)</p> Signup and view all the answers

What is the primary function of inhibitory effects during the intestinal phase?

<p>To protect the intestine from too much acidity (D)</p> Signup and view all the answers

Which phase is characterized by enterogastric reflex and hormonal mechanisms for inhibiting gastric secretions?

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

What is the function of parietal cells in the stomach?

<p>Make stomach contents acidic to break down proteins (C)</p> Signup and view all the answers

What is the main function of chief cells in the stomach?

<p>Release digestive enzymes like pepsinogen (A)</p> Signup and view all the answers

Which type of cell secretes hormone gastrin in the stomach?

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

Why is intrinsic factor produced by parietal cells important?

<p>Required for absorption of vitamin B12 in the small intestine (A)</p> Signup and view all the answers

What is the role of lipases in the stomach?

<p>Digest fat and break down lipids (A)</p> Signup and view all the answers

Which process does the stomach carry out that involves denaturing proteins?

<p>Carrying out breakdown of food (A)</p> Signup and view all the answers

Which organ is the major organ of digestion and absorption?

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

What is the function of the pancreas in the digestive system?

<p>Production of digestive enzymes (C)</p> Signup and view all the answers

Which part of the small intestine is 8 feet long and attached posteriorly by mesentery?

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

Where does the small intestine join the large intestine?

<p>At the ileocecal valve (A)</p> Signup and view all the answers

What is the diameter range of the small intestine?

<p>2.5-4 cm (B)</p> Signup and view all the answers

Which gland is NOT an accessory digestive organ mentioned in the text?

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

Which molecule is the fuel most commonly used by cells to make ATP?

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

What should dietary requirements mostly consist of, according to the text?

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

Which lipid is found in saturated fats in meat, dairy foods, tropical oils, or hydrogenated oils?

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

What is the main function of adipose tissue in the body?

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

Which lipid type is used in myelin sheaths and all cell membranes?

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

What is the function of prostaglandins in the body?

<p>Smooth muscle contraction (D)</p> Signup and view all the answers

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