Across
- 4. A nerve ending
- 5. Provides energy for the cell
- 7. This system involves organs like the kidneys and bladder
- 8. An action or condition that causes a response
- 12. An organism made of one cell
- 13. This system contains the brain and spinal cord
- 14. The basic unit of living things
- 17. A specialized structure inside a cell
- 18. These are sent out when there is a stimulus
- 19. The system that absorbs nutrients
- 21. The control center of the cell
- 23. The system that controls movement of the body
- 24. A barrier that controls what enters and exits the cell
- 25. The organ that interprets all stimuli
- 26. The system that pumps blood
Down
- 1. A signal that enters the body through physical touch
- 2. The site of photosynthesis in plant cells
- 3. What something does
- 6. A signal that enters the body through chemicals
- 9. An organism made of many cells
- 10. A tough barrier not found in animal cells
- 11. A mass of similar cells together
- 15. A collection of tissues joined together performing a specific function
- 16. The system that provides oxygen for blood
- 20. Another term for a body system
- 22. A specialized cell that transmits electrochemical signals