| A | B |
|---|
| blood | a tissue made of cells, platelets and plasma |
| plasma | the liquid part of blood - mostly water |
| pressure | what is lost after a major injury |
| marrow | soft material inside of bones where blood is made |
| red blood cells | main job is to carry oxygen |
| hemoglobin | a red, iron-containing pigment found in red blood cells |
| white blood cells | fight bacteria, viruses and other foreign substances |
| platelets | cell fragments that help to heal wounds |
| clotting | process by which a broken blood vessel seals off |
| cilia | trap bacteria in the trachea |
| trachea | tube from nose/mouth to lungs |
| immune system | a complex group of defenses that work to fight disease in your body |
| antigens | proteins and chemicals that are foreign to your body |
| antibody | the substance produced in response to a specific antigen |
| immunity | protection against the harmful effects of a disease-causing substance |
| vaccine | gives active immunity without you having to get the disease first |
| active immunity | occurs when your body makes its own antibodies in response to an antigen |
| passive immunity | occurs when antibodies produced by another source are put in your body |
| communicable disease | a disease that is spread from one organism to another |
| colds | caused by viruses |
| STD | disease transmitted from one person to another during sexual contact |
| genital herpes | STD with no cure and no vaccine to prevent it |
| AIDS | Acquired Immune Deficiency Syndrome |
| HIV | virus that causes AIDS |
