BLOOD

10. The average lifespan (in days) of a red blood cell.
11. The measure of the percentage of whole blood volume made up of red blood cells.
14. The liquid component of blood, making up about 55% of its volume.
15. Immune cells that directly attack infected cells and tumors.
16. White blood cells that produce antibodies to target bacteria and viruses.
18. The disk-like shape of a red blood cell with a flattened center.
19. Positive The blood type known for being able to receive blood from "All Types".
20. The medical term for white blood cells.

1. The process of blood clotting facilitated by platelets.
2. The medical term for red blood cells.
3. The highly regulated process of forming blood cells.
4. The major type of white blood cell that includes T cells and B cells.
5. A test where blood cells are examined under a microscope.
6. The protein in red blood cells that carries oxygen.
7. The hormone, produced by kidneys, that controls red blood cell production.
8. The mixture of plasma and cells running through veins and arteries.
9. The most common type of white blood cell and the body’s first line of defense.
12. Another name for platelets.
13. The number of days it takes for red blood cells to mature in the bone marrow.
16. The site where blood cells start as immature cells.
17. Red blood cells are unique because they lack this organelle to be more flexible.