cells and body systems

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Across
  1. 3. a group of organs that work together to preform a certain task
  2. 5. a rigid frame-like covering that surrounds the cell membrane
  3. 6. a fairly large black spherical structure thats usually near the centre of the cell
  4. 9. provides a movable transport frame for the body
  5. 12. tiny blood vessels that connect arteries to veins one cell layer thick extremely narrow
  6. 13. an individual unit of life
  7. 14. a group of tissues the preform a special function
  8. 16. remove chemicals and gaseous waste from the blood
  9. 17. blood cells specialized to fight infection
  10. 19. protects the body's external environment from the external environment
  11. 21. coordinate and control the action of all organs and organ systems
  12. 24. clear liquid filled spaces in various places within the cytoplasm
  13. 25. a group of specialized cells
Down
  1. 1. blood vessels that return blood from the body to the heart
  2. 2. breaks down food pieces into much smaller pieces so that they can be absorbed and transported throughout the body
  3. 4. small finger like projections on the inner surface of the small intestines that absorb nutrients
  4. 7. transports oxygen from the outside of the body to the inside of the body
  5. 8. poisonous substance converted from highly toxic ammonia by the liver
  6. 10. thick walled blood vessels that take blood away from the heart to the rest of the body
  7. 11. looks like a thin line that surrounds the whole cell
  8. 15. an organ in the human or animal body that secretes particular chemical substances
  9. 18. a liquid inside the cell which has grainy looking bits in it
  10. 20. red liquid inside of a living organism
  11. 22. organs that store water and other substances required by cells
  12. 23. a band or bundle of fibrous tissue in a human