IGCSE terminology

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