Across
- 3. The organism that caused diseases.
- 5. It contains antigen obtained from a part or the whole structure of a weakened or dead virus or bacterium.
- 6. A protein produced by the white blood cells into the bloodstream in response to antigens
Down
- 1. White blood cells engulf and digest the pathogens using enzymes through _____________.
- 2. A foreign substance that comes from the outside of the body and induces the production of antibodies.
- 4. The ability of the body system to resist pathogens before it is infected.