Digestive System Chapter 23: Overview and GI Tract Layers
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Questions and Answers

What type of epithelium is found in the stomach and intestines of the GI tract?

  • Columnar (correct)
  • Cuboidal
  • Non-keratinized, stratified squamous
  • Simple squamous

Which layer of the GI tract is responsible for mechanical digestion and peristalsis in the small intestine?

  • Submucosa
  • Muscularis mucosa
  • Muscularis (correct)
  • Mucosa

What is the function of the lamina propria in the mucosa of the GI tract?

  • Absorbing nutrients
  • Transporting absorbed nutrients (correct)
  • Secreting mucus
  • Mechanical digestion

Which accessory digestive organ is responsible for secreting bile to aid in digestion?

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

In which part of the GI tract do we find skeletal muscle for swallowing and defecation?

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

What is the function of the submucosal plexus in the GI tract?

<p>Collection of nerves (A)</p> Signup and view all the answers

What is the primary function of chemical digestion in the digestive system?

<p>Breaking down complex food molecules into their building blocks (D)</p> Signup and view all the answers

Which of the following is NOT a type of reflex involved in the regulatory mechanisms of the digestive system?

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

What is the function of Short reflexes in the digestive system?

<p>Activate glands and muscle (D)</p> Signup and view all the answers

What controls the release of gastric acid in the digestive system?

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

Which part of the mouth plays a role in preventing food from entering the nasal cavity?

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

What is the primary function of the tongue in the digestive process?

<p>Mechanical and chemical digestion, swallowing, and vocalization (D)</p> Signup and view all the answers

What is the function of intrinsic factor in the stomach?

<p>Facilitates the absorption of vitamin B12 in the small intestine (B)</p> Signup and view all the answers

Which accessory organ produces bile salts to emulsify lipids for digestion and absorption?

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

What is the primary function of the pancreatic bicarbonate in digestion?

<p>Neutralizing acidic chyme (D)</p> Signup and view all the answers

Which organ releases bile to aid in digestion?

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

What is the main purpose of segmentation in the small intestine?

<p>Optimizing surface area for enzymatic activity (A)</p> Signup and view all the answers

What is the function of mucus in the large intestines?

<p>Easing passage of feces through colon (A)</p> Signup and view all the answers

What is the primary function of the lower esophageal sphincter?

<p>To prevent acid reflux from the stomach (GERD) (B)</p> Signup and view all the answers

Which of the following accurately describes the process of deglutition (swallowing)?

<p>It is a three-phase process involving voluntary, pharyngeal, and esophageal phases (A)</p> Signup and view all the answers

Which part of the stomach is responsible for storing undigested food and gases?

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

What is the function of the pyloric sphincter?

<p>To control the emptying of chyme from the stomach into the duodenum (B)</p> Signup and view all the answers

Which statement about the stomach is accurate?

<p>The stomach can stretch to hold up to 4 liters of food and liquid (A)</p> Signup and view all the answers

What are the folds called in the deflated stomach when it is empty?

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

Which layer of the stomach is the most superficial?

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

What is the primary role of the autonomic nervous system in regulating the alimentary canal?

<p>Restricting enteric neurons (D)</p> Signup and view all the answers

What is the primary function of the peritoneal cavity?

<p>Holding digestive organs in place (A)</p> Signup and view all the answers

What is the main role of the mouth in the digestive process?

<p>All of the above (D)</p> Signup and view all the answers

How does the hepatic portal system contribute to the blood supply of the alimentary canal?

<p>Both a and b (B)</p> Signup and view all the answers

What is the primary function of the submucosal plexus of the enteric nervous system?

<p>Regulating digestive secretions (D)</p> Signup and view all the answers

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