Leukocyte Migration Process Quiz
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Questions and Answers

What is the major function of MHC?

  • To produce antibodies against foreign antigens
  • To regulate blood sugar levels
  • To bind to processed antigen peptides and initiate an immune response (correct)
  • To eliminate bacteria from the body

Which cells express MHC class II molecules?

  • Red blood cells
  • T lymphocytes
  • Dendritic cells, Macrophages, B lymphocytes (correct)
  • All cell types

How many major classes of membrane-bound glycoproteins are encoded by MHC?

  • Four
  • One
  • Two (correct)
  • Three

What does MHC stand for?

<p>Major Histocompatability Complex (A)</p> Signup and view all the answers

Which cells recognize MHC class I molecules?

<p>CD8+ cytotoxic T cells (CTL) (D)</p> Signup and view all the answers

What is the human equivalent of the Major Histocompatibility Complex?

<p>Human Leukocyte Antigen (HLA) (D)</p> Signup and view all the answers

What is the main function of MHC class I?

<p>Binding and presenting endogenous antigens (D)</p> Signup and view all the answers

Which cells function as antigen presenting cells (APC)?

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

What is the process of antigen presentation?

<p>Displaying antigens within a cleft of an MHC molecule (C)</p> Signup and view all the answers

Where are endogenous antigens degraded into peptides?

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

What is the role of transporters associated with antigen processing (TAP) molecules?

<p>Pumping peptides from the cytosol into the endoplasmic reticulum (D)</p> Signup and view all the answers

Which molecules release CLIP from the MHC molecule during antigen presentation?

<p>HLA-DM (A)</p> Signup and view all the answers

What is the function of HLA class II?

<p>Binding and presenting exogenous antigens (C)</p> Signup and view all the answers

What happens to exogenous antigens within the cell?

<p>They are internalized and degraded within endocytic compartments (A)</p> Signup and view all the answers

Which process involves cells moving from the blood vasculature to peripheral tissues?

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

Which cell surface polypeptides ensure appropriate cell-cell interactions?

<p>Mucin-like CAMs (Addressins) (C)</p> Signup and view all the answers

What binds to CD34 and Glycam-1 (mucin-like) on endothelial cells?

<p>L-selectin on leukocytes (A)</p> Signup and view all the answers

Which molecules contain immunoglobulin-like domains and are expressed on endothelial cells?

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

What are the examples of Integrins that bind to Ig-superfamily CAMs?

<p>LFA-1, Mac-1, and VLA-4 (B)</p> Signup and view all the answers

Which group of proteins bind selectins and are rich in serine and threonine?

<p>Mucin-like CAMs (Addressins) (D)</p> Signup and view all the answers

What is the process where leukocytes settle-out of the central flow column and 'marginate' along the endothelial surface?

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

What is the name of the complementary surface adhesion molecules briefly sticking and releasing, causing leukocyte tethering then rolling along the endothelium?

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

What is the speed of tethering for leukocytes?

<p>$400$ microns/sec (A)</p> Signup and view all the answers

Which molecules participate in the adhesion by conformational changes to the integrin, allowing firm binding to Ig superfamily CAMs?

<p>$ICAM-1$ and $VCAM-1$ (C)</p> Signup and view all the answers

During transmigration, cells must flatten and cross the endothelium basement membrane via:

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

What do leukocytes migrate towards by following a chemical gradient (chemokine) to the site of injury?

<p>$Cytokines$ (e.g., $IL-8$) (D)</p> Signup and view all the answers

What is the first step in lymphocyte migration?

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

Which molecules can cause chemotaxis for leukocytes?

<p>$Complement$ components ($C3a, C4a, and $C5a$) (D)</p> Signup and view all the answers

What is shed during the rolling phase?

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

What speed does rolling occur at?

<p>$40$ microns/sec (C)</p> Signup and view all the answers

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