Across
- 3. this systems helps maintain the "saltyness" of the blood and bodily fluids
- 4. fights off foreign invaders
- 6. the glands of this system often swell if you have an infection
- 7. hormones
- 9. contains contractile tissue
- 10. skin, hair and nails
- 12. responsible for gas exchange with the environment
Down
- 1. this system makes blood cells
- 2. this system is responsible for processing food
- 5. includes heart and blood vessels
- 8. the neuron is the functional unit of this system
- 11. includes the ovaries and testes