10-L2

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Questions and Answers

What is the primary function of APCs in the immune system?

  • To store antigens
  • To trigger an immune response (correct)
  • To phagocytose foreign particles
  • To produce antibodies

Which of the following is a feature of professional APCs?

  • Inducible expression of MHC class II molecules
  • Phagocytic activity in the presence of DAMPS
  • Limited antigen-presenting functions
  • Constitutive expression of MHC class II molecules (correct)

Which cell type internalizes antigens via BCRs?

  • B cells (correct)
  • Mast cells
  • Macrophages
  • Dendritic cells

What is a key feature of atypical APCs?

<p>Inducible expression of MHC class II molecules (B)</p> Signup and view all the answers

Where do activated DCs localize to?

<p>T cell zones of lymph nodes (D)</p> Signup and view all the answers

What is a limitation of antigen-presenting functions in atypical APCs?

<p>Limited to specific immune environments (A)</p> Signup and view all the answers

What is not supported by evidence in atypical APCs?

<p>Ability to activate naive CD4+ T cells (D)</p> Signup and view all the answers

What is the function of the mucociliary escalator in the body?

<p>To clear pathogens from epithelial surfaces (A)</p> Signup and view all the answers

What is a characteristic of innate immune response?

<p>It is present from birth (A)</p> Signup and view all the answers

Where are the majority of plasma proteins in the complement system produced?

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

What is the function of nasal hairs in the body?

<p>To filter the air we breathe (C)</p> Signup and view all the answers

What is the role of C3 fragments in the complement system?

<p>To stimulate phagocytosis of microorganisms (A)</p> Signup and view all the answers

What is the function of saliva in the body?

<p>To flush out pathogens from the mouth (B)</p> Signup and view all the answers

What is the mechanism by which the complement system helps with phagocytosis?

<p>Opsonization of antigens by complement (A)</p> Signup and view all the answers

What is the result of the binding of antibody to microorganisms in the neutralization mechanism?

<p>Blockage of adhesion to cells and inactivation of toxins (C)</p> Signup and view all the answers

What is the function of the adaptive immune response?

<p>To provide specific, long-term immunity against infection (B)</p> Signup and view all the answers

What is the role of the membrane attack complex (MAC) in the complement system?

<p>To lyse microorganisms by forming pores in their cell membranes (A)</p> Signup and view all the answers

What is the function of coughing and sneezing in the body?

<p>To clear pathogens from the respiratory tract (D)</p> Signup and view all the answers

What is the function of the complement system in the body?

<p>To help eliminate pathogens from the body (B)</p> Signup and view all the answers

What is the function of agglutination in the complement system?

<p>To form aggregates of antigens, making them more susceptible to phagocytosis (A)</p> Signup and view all the answers

What is the purpose of the complement system in the immune response?

<p>To help destroy pathogens and protect damaged or infected areas (C)</p> Signup and view all the answers

What is the primary function of phagocytosis?

<p>To engulf and digest foreign particles and bacteria (A)</p> Signup and view all the answers

Which cells are primarily involved in anti-parasite immunity?

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

What is the role of opsonisation in the innate immune response?

<p>To mark foreign particles for phagocytosis (B)</p> Signup and view all the answers

Which cell type is involved in the protection of mucosal surfaces from allergy?

<p>Mast cells and basophils (A)</p> Signup and view all the answers

What is the timing of innate immunity after infection?

<p>Seconds to minutes (B)</p> Signup and view all the answers

Which cell type is involved in the interaction with other cells of the innate and adaptive immune systems?

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

What is the role of epithelial cells in the innate immune response?

<p>To provide a physical barrier against pathogens (D)</p> Signup and view all the answers

What is the primary function of the immune system?

<p>To distinguish 'self' from 'non-self' (D)</p> Signup and view all the answers

What type of cells are classified as B, T, or natural killer cells?

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

What is the role of macrophages in the immune system?

<p>To neutralize foreign molecules (D)</p> Signup and view all the answers

What is the function of antigen-presenting cells (APCs)?

<p>To activate T cells (B)</p> Signup and view all the answers

What is the origin of cells in the immune system?

<p>From hematopoietic stem cells (B)</p> Signup and view all the answers

Where are the cells of the immune system distributed?

<p>Throughout the body in the blood, lymph, and epithelial and connective tissues (C)</p> Signup and view all the answers

What are the larger lymphoid organs in the immune system?

<p>Lymph nodes, spleen, thymus, and bone marrow (C)</p> Signup and view all the answers

What is the function of dendritic cells in the immune system?

<p>To present antigens to T cells (A)</p> Signup and view all the answers

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