Blood

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Across
  1. 2. a protein in red blood cells that carries oxygen
  2. 3. An organism that can be seen only through a microscope
  3. 4. a type of white blood cell that plays a crucial role in the body’s immune system
  4. 6. Mature red blood cells
  5. 8. White blood cell that originate in the bone marrow and are part of the body’s innate immune system
  6. 9. Small, colorless cell fragments in our blood that form clots and stop or prevent bleeding
  7. 11. a type of white blood cell that plays a role in the immune system
  8. 13. Foreign substances that trigger the immune system to produce antibodies to fight them off
  9. 14. A type of blood cancer that originates in plasma cells, a type of white blood cell found in the bone marrow
  10. 15. Chemical substances that act like a messenger molecule in the body
Down
  1. 1. a low number of platelets in the blood
  2. 5. a type of cancer that affects the blood and bone marrow
  3. 7. Causes by to much red blood cell breakdown or liver injury
  4. 10. type of white blood cell that are apart of immune system, help body fight against disease and infection
  5. 12. Infection of blood by bacteria or viruses