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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?

Primary response Signup and view all the answers

What type of immunity is promoted by immunization?

Active immunity Signup and view all the answers

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

To boost the secondary response Signup and view all the answers

Which of the following is NOT a function of perforins?

immune cell stimulation Signup and view all the answers

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

5, 2, 1, 3, 4 Signup and view all the answers

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

to increase the likelihood of a successful transplantation Signup and view all the answers

What is another term for an effector B cell?

plasma cell Signup and view all the answers

What is the function of histamines?

dilation of capillaries Signup and view all the answers

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

stimulation of immune cells Signup and view all the answers

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

To secrete cytokines that stimulate immune cells Signup and view all the answers

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

To recognize and eliminate infected cells Signup and view all the answers

How do Cytotoxic T cells eliminate infected cells?

By releasing proteins that disrupt the membranes of target cells and trigger apoptosis Signup and view all the answers

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

The immune system becomes less effective against infections Signup and view all the answers

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

To produce antibodies against pathogens Signup and view all the answers

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

Humoral response defends against extracellular pathogens, while cell-mediated response defends against intracellular pathogens Signup and view all the answers