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

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

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

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

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

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

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

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

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

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

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

    Which organ releases bile to aid in digestion?

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

    What is the function of mucus in the large intestines?

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

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

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

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

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

    Which layer of the stomach is the most superficial?

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

    What is the primary function of the peritoneal cavity?

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

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

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

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