| A | B |
|---|
| Active Immunity | the body makes its own antibodies against a particular pathogen |
| Arteries | blood vessels that carry oxygenated blood away from the heart |
| Atria | upper chambers of the heart |
| Capillaries | the smallest blood vessels |
| Hemoglobin | iron rich pigment that makes blood red; carries oxygen throughout the body |
| Immunity | the ability of the body to resist certain disease causing organisms |
| Passive Immunity | temporary immunity to a disease produced by the injection of antibodies into the body |
| Pathogens | disease causing organisms |
| Red Blood Cells | most abundant blood cells that are shaped like plates that are indented in the middle |
| Vaccination | injection consisting of a dead or weakened form of a disease that causes the body to make antibodies to fight off the disease |
| Veins | blood vessels that transport blood under low pressure from the capillaries back to the heart |
| Ventricles | lower chambers of the heart, used for pumping |
| White Blood Cells | fight against infections |
