Across
- 2. a substance used to stimulate immunity to a particular infectious disease or pathogen.
- 4. the most abundant biological entities on Earth.
- 6. an operation in which an organ or tissue is transplanted.
- 7. They help the body fight infection and other.
- 9. a bacterium, virus, or other microorganism that can cause disease.
- 11. results from the production of antibodies by the immune system in response to the presence of an antigen.
- 12. occurs when the body's immune system sees a substance as harmful and overreacts to it.
Down
- 1. the short-term immunity which results from the introduction of antibodies.
- 3. a toxin or other foreign substance which induces an immune response in the body, especially the production of antibodies.
- 5. A type of blood cell that is made in the bone marrow and found in the blood.
- 8. the immune system's way of protecting the body against an infectious disease
- 10. a blood protein produced in response to and counteracting a specific antigen.