science

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Across
  1. 2. organ system responsible for movement
  2. 3. an organism's control center
  3. 4. The muscular tube through which food passes from the throat to the stomach.
  4. 6. eletal muscles that contract and relax under conscious control.
  5. 8. Loosening, lengthening, or lessening of tension in a muscle
  6. 9. produces a response in an organism or in a cell or tissue of an organism.
  7. 12. consists of the brain and spinal cord, to which sensory impulses are transmitted
  8. 13. the moving food through digestion system
  9. 14. chemical substances that act like messenger molecules in the body
  10. 15. when muscles get smaller
Down
  1. 1. behaviour that usually occur as direct and immediate response
  2. 5. the connection between the central nervous system and the rest of the body.
  3. 7. a joint that swings freely
  4. 10. moves without thinking about it
  5. 11. found in the walls of internal organs