Across
- 4. the same on both sides
- 6. diffuses through protein doorways
- 8. cell binds to specific sites on the plasma membrane
- 9. the smallest living organism
- 11. pseudopods bring in substances
- 15. allows things to enter
- 16. organs that work together
- 17. two or more tissues that work together
- 18. the way the molecules flow
- 19. substances move high to low particles through protein channels
- 20. does not require energy
- 21. flows through easily
Down
- 1. brings fluids into the cell
- 2. the movement of water
- 3. similar cells that work together
- 5. requires energy
- 7. several organ systems that work together
- 10. allows things to exit
- 12. energy source for active transport
- 13. multiple cells
- 14. single cell