Coordinated Body Systems

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Across
  1. 3. sheath the insulating layer that covers a neurone
  2. 4. an organism that lives on or in the body of another organism and takes nutrients from it; the host gets nothing in return and may be harmed
  3. 7. a substance that kills bacteria or prevents the growth of bacteria
  4. 10. chemical substances that act as messengers in the body
  5. 11. a chemical that kills fungi
  6. 16. an infectious disease spread through contaminated water
  7. 18. the system in your body that fights infections
  8. 21. a pathogen about one hundred times smaller than a bacterium
  9. 22. any factor that stimulates a receptor and brings about a response
  10. 23. the brain and the spinal cord
  11. 25. the part of the neurone that contains the nucleus
  12. 26. a chemical that causes your body to react as if it had encountered a pathogen
  13. 27. all the chemical reactions occurring in the cells
  14. 28. branches from the cell body that receive messages from other neurones
  15. 29. a viral disease; symptoms include a rash of small, itchy blisters
  16. 30. a nerve fibre that sends nerve impulses away from the cell body
Down
  1. 1. the space between two neurones
  2. 2. an early antibiotic
  3. 5. the system controlling involuntary actions such as the heartbeat
  4. 6. the organism a parasite lives in
  5. 8. a chemical message released at the end of an axon to be received by the next neurone's dendrites
  6. 9. a chemical made by the immune system that makes it possible for white blood cells to destroy pathogens
  7. 12. part of the brain that is responsible for coordination and balance
  8. 13. muscles or glands that put the messages into effect
  9. 14. a white blood cell that makes antibiotics and is found in the lymph nodes
  10. 15. nerve cells that carry messages from the CNS to effectors
  11. 17. a substance that speeds up the rate of a reaction without being used up in the process
  12. 19. quick, automatic actions that protect
  13. 20. part of the brain where the spinal cord enters the skull; it controls the body's vital functions such as breathing, blood pressure and heart rate
  14. 24. an organism that causes disease