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