cells and body systems

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Across
  1. 3. small, pliable cells with no nucleus that are specialized for carrying oxygen to all cells of the body
  2. 5. waste removal
  3. 6. small finger-like projections on the inner surface of the small intestine that absorb nutrients
  4. 9. made of more than one cell
  5. 10. substance created by the body to carry out chemical digestion
  6. 11. blood vessels that return blood from the body to the heart
  7. 14. wave-like muscles contractions along the digestive system
  8. 16. a group of tissue that work together to form a specific function
  9. 17. physical breakdown of food into small particles
  10. 21. large muscle below the lungs that moves air on and out of the lungs
  11. 22. tiny air-filled sacs in the lungs, sight of gas exchange
  12. 23. thick-walled blood vessels that take blood away from the heart to the rest of the body
  13. 24. type of connective tissue found in the bones that produce red blood cells
  14. 25. made of just one cell
Down
  1. 1. breakdown of large food particles into smaller particles by enzymes
  2. 2. a membrane with small openings that allow particles of some substances but not others to pass through
  3. 4. a living thing
  4. 7. specialized cells of the nervous system that receive and transmit information
  5. 8. help to stop bleeding at cuts/open wounds
  6. 12. the basic unit of life
  7. 13. group of similar cells working together to perform a specific function
  8. 15. blood cells specialized to fight infection
  9. 18. filtering units of the kidney that removes waste from the blood and produce urine
  10. 19. tiny blood vessels that connect arteries to veins, one cell layer thick and extremely narrow
  11. 20. group of organs that work together to perform a certain task