1. Mike injured his knee while playing. Examination revealed that the injured area was red, swollen, and warmer than the surrounding area. What does this condition indicate?
an inflammation
a tumor-like growth
a hemorrhage
2. When a virus invades the body, some B cells recognize it as nonself and produce plasma cells that release a substance to kill the virus. What is this substance called?
antigen
antibody
pathogen
3. Which of the following forms blood clots?
fibrin
macrophages
thrombin
4. An antigen has invaded a mammal's body. Specific immune cells engulf and ingest it. Some of the digested pieces are displayed on the cells' bodies. What happens next?
B cells are activated and release antibodies.
T cells are activated and produce clones.
B cells withdraw the immune response as the antigen is killed.
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