| Question | Answer |
|---|---|
| veins | blood vessels that carry blood back to the heart |
| arteries | blood vessels that carry blood away from the heart |
| capillaries | tiny, thin-walled blood vessels that allow the exchange of gases and nutrients between the blood and cells and are located between arteries and veins |
| platelets | the smallest "cells" in your body, that are actually pieces of a kind of white blood cell. They aid in blood clotting. |
| blood clotting | the process that keeps us from bleeding to death when we are cut |
| antibodies | chemicals that are released into the blood to fight the pathogen |
| respiratory system | the system that controls how we breathe |
| diaphragm | the most important skeletal muscle |
| hemoglobin | the protein in red blood cells that gives blood its red color |
