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| 4 | The system that helps fight pathogens and disease |   
| 5 | Layer of skin |   
| 6 | There are three of these in the immune system |   
| 7 | Special cells of the immune system that recognize foreign invaders |   
| 9 | Used to help develop an immunity to a disease |   
| 10 | Like spit |   
| 11 | Abnormal condition that effects the body |   
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| 1 | A fluid membrane in the throat, nose, and mouth |   
| 2 | The special organ where white blood cells mature |   
| 3 | Two types: B-cells and T-cells |   
| 8 | Small hairlike structures |   
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