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Number 1. starts with a distinctive rash that progresses to pus-filled blisters and can result in disfiguration, blindness, and death

Correct Answer: smallpox

Number 2. functions to defend and protect the body by 1. scavenging dead, dying body cells; 2. destroying abnormalities (cancerous); and 3. protecting from pathogens and foreign molecules: parasites, bacteria, viruses.

Correct Answer: immune system

Number 3. the individuals in your body’s military that are defending and protecting, also called white blood cells; they are produced in the bone marrow from hematopoietic stem cells

Correct Answer: leukocytes

Number 4. disease-causing organisms such as certain types of bacteria, protists, and viruses

Correct Answer: pathogens

Number 5. a foreign substance that triggers a reaction from the immune system often found on the surfaces of bacteria and viruses

Correct Answer: antigen

Number 6. part of the immune system with its network of vessels, cells, and organs that carry and filter the excess fluids in tissues (or lymph) back to the bloodstream. This process filters pathogens from the blood.

Correct Answer: lymphatic system

Number 7. a type of blood cell involved with an immune response also called leukocytes

Correct Answer: white blood cells

Number 8. cells that capture and present antigens as part of the immune response

Correct Answer: dendritic cells

Number 9. lymph once it has entered the lymphatic system; plasma that becomes extra fluid ending up in the spaces between cells (tissue fluid)

Correct Answer: interstitial fluid