Cells and Body Systems

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Across
  1. 3. Automatic response to a stimulus without conscience control.
  2. 4. Group of organs that work together to perform a task.
  3. 7. Usually uni-cellular organisms that can only be seen with a microscope.
  4. 9. Cells specialized to fight infection.
  5. 10. A nerve that leads to the retina from the brain.
  6. 11. group of cells that work together to perform a task.
  7. 12. Plays a major role in breathing.
  8. 13. Organelle that directs everything in a cell.
  9. 14. Cells that are specialized for carrying oxygen.
  10. 16. Cells that have specific structures that help perform certain tasks.
  11. 20. Organ system that moves bones and certain organs.
  12. 22. Contains nutrients a cell needs to survive.
  13. 23. Poisonous substance converted from highly toxic ammonia by the liver.
  14. 24. Specialized cells of the nervous system that receive and send information.
Down
  1. 1. Covers the surface of the body and lines the inside of some other organs.
  2. 2. Tissue of brain, spinal cord and nerves.
  3. 5. Organ system that supplies blood with oxygen.
  4. 6. Substance created by the body to carry out chemical digestion.
  5. 8. Provides mobile support frame for the body; protects soft tissue organs.
  6. 10. Organised and special structures within a living cell.
  7. 15. Group of tissues that work together to perform a task.
  8. 17. The basic unit of all living things.
  9. 18. A living thing.
  10. 19. Tissue that allows movement.
  11. 21. Organism made of more than one cell.