Digestive System Overview
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Questions and Answers

What is the purpose of the accessory organs in the digestive system?

  • To increase the length of the alimentary canal
  • To transport nutrients to different parts of the body
  • To provide structure to the intestines
  • To aid in breaking down food (correct)

Which layer of the alimentary canal replenishes itself every 3-7 days?

  • Serosa
  • Epithelium (correct)
  • Muscularis
  • Submucosa

What is the function of the lamina propria in the mucosa layer?

  • To increase surface area for digestion
  • To release hormones
  • To contain blood and lymphatic vessels (correct)
  • To replenish itself constantly

Which organ is not considered an accessory organ of the digestive system?

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

What is the role of muscularis mucosa in the alimentary canal?

<p>To promote mechanical digestion and peristalsis (B)</p> Signup and view all the answers

Why is there skeletal muscle at both ends of the alimentary canal?

<p>To control what goes in and out (A)</p> Signup and view all the answers

What is the primary function of the myenteric plexus?

<p>To control the contractions of the alimentary canal (C)</p> Signup and view all the answers

Which structure separates the abdominal cavity into two parts?

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

What is the primary function of the tongue during ingestion?

<p>To position food for chewing and swallowing (B)</p> Signup and view all the answers

Which of the following is NOT a major salivary gland?

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

What is the function of the epiglottis?

<p>To prevent food from entering the trachea (C)</p> Signup and view all the answers

Which phase of swallowing is controlled by the medulla oblongata?

<p>All phases of swallowing (B)</p> Signup and view all the answers

What is the primary function of the stomach?

<p>To store and mix food before digestion (D)</p> Signup and view all the answers

Which of the following is NOT a type of tooth in the permanent human dentition?

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

What is the function of the lingual frenulum?

<p>To hold the tongue in place (B)</p> Signup and view all the answers

Which of the following is responsible for the dry mouth feeling associated with anxiety?

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

What is the main function of the pyloric sphincter?

<p>To control the movement of food from the stomach into the duodenum (D)</p> Signup and view all the answers

Which cells in the stomach secrete hydrochloric acid (HCl) and intrinsic factor?

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

What is the primary function of pepsin in the stomach?

<p>To break down proteins (B)</p> Signup and view all the answers

Which phase of gastric secretion occurs when the smell or thought of food triggers the release of gastric juices?

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

What is the primary function of the mucosal barrier in the stomach?

<p>To protect the stomach lining from being digested by gastric juices (B)</p> Signup and view all the answers

Which part of the small intestine is the longest?

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

What is the primary function of the villi in the small intestine?

<p>To increase the surface area for absorption (D)</p> Signup and view all the answers

Which hormone is responsible for initiating peristaltic contractions in the small intestine after most of the chyme has been absorbed?

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

What is the primary function of the circular folds in the small intestine?

<p>To slow down the movement of chyme for better absorption (D)</p> Signup and view all the answers

Which part of the small intestine receives bile and pancreatic juice through the hepatopancreatic ampulla?

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

What is the function of the ileocecal sphincter in the digestive system?

<p>Relaxing to permit passage of chyme (C)</p> Signup and view all the answers

Why does constipation occur if defecation is voluntarily delayed?

<p>Excessive water absorption through osmosis (D)</p> Signup and view all the answers

In the digestive system, where does lipid breakdown primarily occur?

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

What is the main function of dendritic cells in the digestive system?

<p>Monitoring gut bacteria (C)</p> Signup and view all the answers

Which organ is primarily responsible for secreting bile into the small intestine?

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

What is the primary role of hepatic portal vein in the digestive process?

<p>Bringing oxygenated blood to the liver (B)</p> Signup and view all the answers

Which action leads to mass movement in the large intestine?

<p>Bearing down for defecation (C)</p> Signup and view all the answers

What is the primary purpose of bile canaliculi in the liver?

<p>Collecting bile secreted by hepatocytes (A)</p> Signup and view all the answers

Which enzyme is responsible for digesting proteins in the small intestine?

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

What happens if bile secretion into the intestines is insufficient?

<p>Formation of white stool with high fat content (D)</p> Signup and view all the answers

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