second half

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Across
  1. 2. a blood protein produced in response to and counteracting a specific antigen
  2. 4. a type of white blood cell that "eats" foreign invaders
  3. 7. disease-causing agent such as a bacterium, virus, fungus, or protozoan
  4. 8. the change in electrical potential of a neuron or other excitable cell relative to its surroundings when not stimulated or involved in passage or an impulse
  5. 9. a colorless cell that circulates in the blood and body fluids and is involved in counteracting foreign substances
Down
  1. 1. a small colorless disk-shaped cell fragment without a nucleus, found in large numbers in blood and involved in clotting
  2. 3. the ability of an organism to resist a particular infection or toxic by the action of specific antibodies or sensitized white blood cells
  3. 5. a toxin or other foreign substance which induces an immune response in the body, especially the production of antibodies
  4. 6. treatment with a vaccine to produce immunity against a disease