Across
- 3. A microorganism that causes disease
- 4. A widespread occurrence of a disease in a community at a particular time
- 5. A tiny infectious agent that can only reproduce inside a host cell
- 8. A type of white blood cell that engulfs and digests pathogens
- 10. The invasion and multiplication of pathogens in the body
- 11. A chemical messenger produced by glands that regulates body functions
Down
- 1. Single-celled organisms that can cause disease or be beneficial
- 2. The maintenance of a stable internal environment in the body
- 6. A substance that helps the body build immunity to a disease
- 7. A substance that triggers the immune system to produce antibodies
- 9. A protein produced by the immune system to fight antigens