| A | B |
|---|
| Allergy | Body overreacts to an antigen that should not cause much problems |
| Antibodies | Chemicals produced by the immune system to destory pathogens |
| ATP | Energy molecule of the body: Made during cellular respiration |
| Pathogen | Any organism that causes disease |
| Antigen | Any substance that the body attacks because it is not supposed to be there |
| Vaccine | Dead or weakened virus or bacteria given to a person to stimulate the immune system and prevent illness |
| Asexual reproduction | Reproduction involving only one parent |
| Host | Organism that a parasite lives on |
| Enzymes | These protein substances affect the rate of chemical reactions |
| AIDS | Disease in which body can not defend itself against pathogens |
| Mitochondria | Cell organelle involved in making ATP (energy) |
| Population | All the members of a species living in an area |
| Community | All the different species living in an area |
| Ventricles | Lower chambers of the heart (pump blood away from heart) |
| Arteries | Carry blood away from heart |
| Cellular respiration | Process that takes place in all cells and allows them to make energy |
| Diffusion | Movement of particles from an area of high concentration to an area of low |
