The two types of leukocytes are phagocytes and lymphocytes.
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Q44: A portal of exit is necessary to
Q45: During incubation, a person experiences early symptoms
Q46: Most people realize they are sick at
Q47: The immune system guards against pathogens.
Q48: White blood cells are known as antigens.
Q50: A person develops active immunity when antibodies
Q51: Passive immunity is long-lasting.
Q52: Infants can acquire passive immunity by ingesting
Q53: Antibiotics promote bacterial infections.
Q54: Antibiotics are specific to certain types of
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