Organ Rejection and Immunization

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Questions and Answers

What is the primary reason for organ rejection in the body?

  • The donor organ is not compatible with the recipient's blood type
  • The donor organ is not genetically engineered
  • The immune system recognizes the donor organ as foreign (correct)
  • The recipient's immune system is weakened

What is the purpose of immunosuppressive drugs in organ transplantation?

  • To weaken the immune response (correct)
  • To promote inflammation
  • To enhance the immune response
  • To destroy the donor organ

What type of vaccine uses messenger RNA (mRNA) molecules to produce specific parts of the virus?

  • Live attenuated vaccine
  • Conjugate vaccine
  • mRNA vaccine (correct)
  • Subunit vaccine

What is the term for the first response to an antigen after immunization?

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

What type of immunity is promoted by immunization?

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

What is the purpose of a 'booster' dose of vaccine?

<p>To boost the secondary response (B)</p> Signup and view all the answers

Which of the following is NOT a function of perforins?

<p>immune cell stimulation (D)</p> Signup and view all the answers

What is the correct order of events during a primary humoral immune response?

<p>5, 2, 1, 3, 4 (D)</p> Signup and view all the answers

What is the purpose of matching MHC proteins between donor tissue and recipient?

<p>to increase the likelihood of a successful transplantation (B)</p> Signup and view all the answers

What is another term for an effector B cell?

<p>plasma cell (B)</p> Signup and view all the answers

What is the function of histamines?

<p>dilation of capillaries (B)</p> Signup and view all the answers

What is the function of cytokines secreted by helper T cells?

<p>stimulation of immune cells (D)</p> Signup and view all the answers

What is the primary function of Helper T cells in the immune response?

<p>To secrete cytokines that stimulate immune cells (A)</p> Signup and view all the answers

What is the role of Cytotoxic T cells in the cell-mediated immune response?

<p>To recognize and eliminate infected cells (B)</p> Signup and view all the answers

How do Cytotoxic T cells eliminate infected cells?

<p>By releasing proteins that disrupt the membranes of target cells and trigger apoptosis (B)</p> Signup and view all the answers

What is the result of HIV infection of Helper T cells?

<p>The immune system becomes less effective against infections (D)</p> Signup and view all the answers

What is the role of B cells in the humoral immune response?

<p>To produce antibodies against pathogens (D)</p> Signup and view all the answers

What is the difference between the humoral and cell-mediated immune responses?

<p>Humoral response defends against extracellular pathogens, while cell-mediated response defends against intracellular pathogens (D)</p> Signup and view all the answers

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