Across
- 2. Message a cell transmits.
- 5. An enzyme that kills bacteria in the eye.
- 6. Chemical substances in a synapse that transfer nerve messages.
- 8. Type of respiration that gives off carbon dioxide, water and energy.
- 9. Type of drugs that block chemicals in the synapse.
- 10. A sense organ that responds to chemicals in the air.
Down
- 1. In cold weather, when arterioles and blood vessels contract to prevent heat loss.
- 3. Maintenance of constant internal conditions.
- 4. Part of the nervous system that extends to the rest of the body.
- 7. Chemical reactions that break down nutrient molecules.