Chapter 21 All Mastering – Flashcards
Unlock all answers in this set
Unlock answersquestion
Frist line of defense against pathogens
answer
Intact skin and mucous membranes
question
Which of the following is NOT a characteristic of Natural Killer (NK) cells?
-NK cells attack infected or cancerous cells.
-NK cells induce the target cell to undergo "apoptosis" (cell suicide).
-NK cells recognize abnormal or cancer cells by a specific antigen on their cell membrane.
-NK cells attack transplanted organs.
answer
NK cells recognize abnormal or cancer cells by a specific antigen on their cell membrane
question
Which of the following innate internal defenses work by interfering with viral replication?
answer
Interferons
question
How do phagocytes recognize foreign cells or bacteria?
answer
The phagocytes recognize molecules on pathogens not normally found on body cells
question
Which of the innate defense mechanisms can lyse bacteria and mark cells for phagocytosis?
answer
Complement Proteins
question
Which of the following can act as opsonins on bacteria, thus enhancing phagocytosis?
answer
Antibodies and complement proteins
question
With what does our immune system coat pathogens to facilitate their capture and accelerate phagocytosis?
answer
Opsonins
question
What protein can be released by infected cells to help protect cells that have not yet been infected?
answer
Interferon
question
How do interferons protect against viral infection in healthy cells?
answer
Interferons block viral reproduction in healthy cells through the production of antiviral proteins.
question
Which of the following phases involves white blood cells leaving capillaries?
answer
Diapedesis
question
Which of the following is an effect of complement activation?
answer
opsonization
question
Which class of tissue graft is the LEAST likely to be accepted by a patient's body?
answer
Xenograft
question
Which of the following is/are the most specific internal defense against disease?
answer
T Cells
question
Which antimicrobial protein triggers inflammation?
answer
Histamine
question
Which of the following are NOT correctly matched?
-multiple sclerosis: autoimmune disorder
-immediate hypersensitivity: allergic contact dermatitis
-AIDS (acquired immune deficiency syndrome): helper T cells are destroyed by a virus
severe combined immunodeficiency -syndrome (SCID): genetic defect resulting in a shortage of B and/or T cells
answer
Immediate Hypersensitivity: Allergic contact dermatitis
question
What type of antigen do T cells NOT recognize?
answer
Self-antigens
question
Which of the following statements does NOT describe the adaptive immune response?
-It is specific
-It occurs immediately after the body is challenged by foreign material
-It is systemic
-It has memory
answer
It occurs immediately after the body is challenged by foreign material
question
Which of the following cells engulf antigens and present fragments of them on their own surfaces for recognition?
answer
Dendritic Cells
