Across

1. 1noun The two organs you use to breathe. (5)
2. 5adjective Lasting a long time, said of an illness. (7)
3. 6noun The organ that controls your body and your thoughts. (5)
4. 7noun The organ that cleans the blood and makes urine. (6)
5. 8noun All the bones of the body together. (8)
6. 9noun The red liquid that carries oxygen. (5)
7. 11adjective Protected against a disease. (6)
8. 13verb To take air in and out of your body. (7)
9. 14noun The organ that pumps blood. (5)
10. 15noun Tissue that contracts to move the body. (6)

Down

1. 2noun A nerve cell that sends signals. (6)
2. 3noun The gas your body needs from the air. (6)
3. 4noun It trains your immune system to fight a disease. (7)
4. 8noun A sign of an illness, like a fever. (7)
5. 10verb To break down food in the body. (6)
6. 12verb To become healthy again. (4)