Tight Junctions and Transmembrane Proteins Quiz
18 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the main function of tight junctions between epithelial cells?

  • To allow for the free movement of hormones and cytokines
  • To prevent the passage of water and solutes between cells (correct)
  • To connect the apical and basolateral domains of the plasma membrane
  • To facilitate paracellular diffusion
  • What is the approximate diameter of tight junction pores in humans?

  • 10-15 Å
  • 1-2 Å
  • 4-8 Å (correct)
  • 20-25 Å
  • What is the role of spectrin in tight junctions?

  • To regulate the paracellular diffusion
  • To stabilize the tight junctions (correct)
  • To connect the tight junctions to the cytoskeleton
  • To facilitate the passage of hormones and cytokines
  • What causes the 'leak' in tight junctions?

    <p>The lack of ATP</p> Signup and view all the answers

    What is the main component of tight junctions that fuse the outer surfaces of adjacent plasma membranes together?

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

    What is the role of tight junctions in leaky epithelia?

    <p>To allow for the free movement of water and solutes</p> Signup and view all the answers

    What is the primary function of adhesive glycoproteins in the ECM?

    <p>To attach cells to the matrix</p> Signup and view all the answers

    Which of the following tissues has the highest abundance of ECM?

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

    What is the primary function of the ECM in providing tissue stability?

    <p>By linking areas of cells together</p> Signup and view all the answers

    What is the role of fibronectin in the ECM?

    <p>To attach cells to the matrix</p> Signup and view all the answers

    What is the primary function of the paracellular pathway in epithelial cells?

    <p>To allow the passage of selective molecules</p> Signup and view all the answers

    What is the role of cell junctions in tissues?

    <p>To provide contact points between cells</p> Signup and view all the answers

    What is the primary function of tight junctions in epithelial cells?

    <p>To provide a barrier to the passage of water and solutes between cells</p> Signup and view all the answers

    What is the characteristic of brain microvessel endothelial cells (BMEC) that restricts the passage of compounds from the blood into the brain?

    <p>Presence of tight junctions between cells</p> Signup and view all the answers

    What is the purpose of tight junctions in the digestive tract?

    <p>To prevent the passage of digestive enzymes and waste products into underlying tissues</p> Signup and view all the answers

    What is the consequence of tight junctions in the transcellular pathway of glucose transport in intestinal epithelial cells?

    <p>Glucose is prevented from being transported through the basolateral surface</p> Signup and view all the answers

    What is the effect of tight junctions on the blood-brain barrier (BBB)?

    <p>Impedes the penetration of potential therapeutic agents into the brain</p> Signup and view all the answers

    What is the role of tight junctions in the isolation of apical and basolateral domains of the plasma membrane?

    <p>To separate and isolate the domains from each other</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Browser