
The way in which a disease is spread from one person to another is known as the ________.
A. transmission
B. treatment
C. pathogen
D. incubation period
Select your answer:

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Microbiology › ViewCytotoxic T cells
A. secrete granzymes and perforins that damage target cells.
B. lack specificity for antigen.
C. secrete interleukin-2 to stimulate B and T cells.
D. are activated by free, soluble antigens.
Respiratory System › View
the windpipe; a passage through which air moves in the respiratory system.
A. trachea
B. lungs
C. larynx
D. bronchi