Human Digestive System Quiz
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Questions and Answers

Which gland is responsible for producing saliva in the mouth?

  • Liver
  • Pancreas
  • Gallbladder
  • Parotid gland (correct)
  • Which part of the alimentary tract is responsible for mechanical digestion of food?

  • Esophagus
  • Duodenum
  • Jejunum
  • Stomach (correct)
  • Which part of the colon is located near the anus?

  • Ascending colon
  • Transverse colon
  • Descending colon (correct)
  • Rectum
  • Which organ is responsible for producing bile that helps in fat digestion?

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

    Which part of the alimentary tract receives bile from the liver and pancreatic juice from the pancreas?

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

    What is the characteristic of gastric smooth muscle?

    <p>It functions as a syncytium</p> Signup and view all the answers

    What is the length of individual smooth muscle fibers in the gut?

    <p>200 to 500μm</p> Signup and view all the answers

    How are the smooth muscle fibers arranged in the gut?

    <p>As many as 1000 parallel fibers in bundles</p> Signup and view all the answers

    What is the orientation of the bundles in the longitudinal muscle layer?

    <p>They extend longitudinally down the intestinal tract</p> Signup and view all the answers

    What is the main determinant of the rhythm of GIT contractions?

    <p>Frequency of slow waves</p> Signup and view all the answers

    What is the orientation of the bundles in the circular muscle layer?

    <p>They extend around the gut</p> Signup and view all the answers

    What is the typical range of intensity of slow waves in the GIT?

    <p>5-15 millivolts</p> Signup and view all the answers

    What is the frequency of slow waves in the duodenum?

    <p>12 per minute</p> Signup and view all the answers

    What is the frequency of slow waves in the body of the stomach?

    <p>3 per minute</p> Signup and view all the answers

    What type of changes in the resting membrane potential are slow waves?

    <p>Slow, undulating changes</p> Signup and view all the answers

    What allows for the movement of ions between muscle cells within a bundle?

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

    In what direction do electrical signals travel more rapidly within a bundle?

    <p>Along the length of the bundle</p> Signup and view all the answers

    What is the function of the loose connective tissue between muscle bundles?

    <p>To partially separate adjacent muscle bundles</p> Signup and view all the answers

    What is the term used to describe the functioning of the smooth muscle layer as a whole?

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

    What is the result of the fusion of muscle bundles at many points?

    <p>A branching mesh of smooth muscle bundles</p> Signup and view all the answers

    What happens to the membrane muscle fibers when the potential becomes less negative?

    <p>They become more excitable</p> Signup and view all the answers

    What is the effect of stretching of the muscle on the membrane?

    <p>It depolarizes the membrane</p> Signup and view all the answers

    Which of the following stimulates the membrane, making it more excitable?

    <p>Release of acetylcholine from the endings of parasympathetic nerves</p> Signup and view all the answers

    What is the effect of hyperpolarization on the muscle fibers?

    <p>They become less excitable</p> Signup and view all the answers

    Which of the following is NOT a factor that depolarizes the membrane?

    <p>Stimulation by sympathetic nerves</p> Signup and view all the answers

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