After receiving a vaccination for the virus that causes chickenpox, Molly plays tag with a
classmate who has chickenpox. Fortunately, the vaccine takes and Molly does not get sick.
Which line of defense remembers the chickenpox virus and prevents Molly from becoming ill?
A. the first line of defense
B. the second line of defense
C. the third line of defense
D. the first line of defense in children, but the second line of defense in adults - ANS-the third
line of defense
An organism's first line of defense against attack by a pathogen such as a virus or bacterium is
usually
A. inflammation at the entry site of the pathogen.
B. a barrier, like the skin of a vertebrate or the cuticle of a plant.
C. antibody production or one of the other adaptive immune responses.
D. phagocytosis of the pathogen or one of the other innate immune responses. - ANS-a barrier,
like the skin of a vertebrate or the cuticle of a plant
Cell-mediated immunity occurs through the actions of
A. B cells.
B. T cells
C. macrophages.
D. neutrophils. - ANS-T cells
During the immune response, which of the following events is likely to happen last?
A. Antibodies that attach to the invading pathogen are produced.
B. Blood clotting prevents excess blood loss.
C. Neutrophils and macrophages enter damaged tissue from the bloodstream.
D. Cytokines are dispersed throughout the bloodstream. - ANS-Antibodies that attach to the
invading pathogen are produced.
Histamine alters small blood vessels to become leaky to both the fluid, which causes swelling,
and the blood proteins that
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