Immune System

5. Lymphocytes, antigens, antibodies, Memory B and T cells that recognize the pathogen if it invades again.
6. The immunities we acquire throughout our lives.
10. External barriers: skin and mucous membranes.
12. Immunity that is present before exposure and effective from birth.
14. Organisms that cause disease.
16. Specialized proteins that aid in destroying infectious agents.
17. Cells manufactured in the bone marrow that create antibodies for isolating and destroying invading bacteria and viruses.
18. Cells created in the thymus that produce substances that attack infected cells in the body.
19. A form of immunity in which the body produces its own antibodies against a disease/infection.
20. Macrophages and inflammatory responses (fever, swelling, redness, heat, and pain.)

1. The short-term immunity that comes from the antibodies from another person or animal.
2. Foreign substances that trigger the attack of antibodies in the immune response.
3. Single-celled organisms that lack a nucleus; prokaryotes - diseases: strep throat, food poisoning, pneumonia.
4. Composed of a network of vessels, ducts, nodes, and organs. Provides defense against infection.
7. Circulate the body, proliferate, and respond to eliminate subsequent invasion by same antigen.
8. Some bacteria are beneficial: breaking down our food, gut health, and fights off harmful bacteria.
9. A tiny, nonliving particle that invades and then reproduces inside a living cell.
11. Contamination or invasion of body tissue by pathogenic organisms.
13. A complex response system that protects the body from bacteria, viruses, and other foreign substances.
15. Found within the lymph node; they destroy bacteria cancer cells, and other foreign matter in the lymphatic stream.