immune system

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Across
  1. 2. recognition of traits specific to particular pathogens, using a vast array of receptors
  2. 4. response(T cells) defend against infection by directly killing or by modulating the immune system response against infection in cells
  3. 6. defense skin, mucous membrane, secretions
  4. 8. substances that elicit a response from a B or T cell
  5. 10. discharge destructive enzymes
  6. 12. cells actively secrete antibodies
  7. 13. circulate in the blood and are attracted by signals from infected tissues
  8. 15. cells) antibodies defend against infection in body fluids
Down
  1. 1. enables an animal to avoid, or limit many infections
  2. 3. cells stimulate development of adaptive immunity in cells that contact the environment
  3. 5. provide innate defense, interfering with viruses and helping activate macrophages
  4. 7. agents that cause disease, infect a wide range of animals, including humans
  5. 9. system consists of about 30 proteins that are activated by substance on microbe surfaces
  6. 11. small accessible part of antigens that bind to an antigen receptor
  7. 14. immunity includes barrier defenses and internal defenses