Cells And Body Systems

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Across
  1. 2. blood vessels that return blood in the body back to the heart
  2. 3. a kind of digestion that includes the breakdown of large food particles by enzymes
  3. 6. long extension of a neuron's cell body that transmits information to neighboring cells
  4. 7. contents of a cell inside the cell membrane excluding thee nucleus
  5. 9. substance created by the body to carry out chemical digestion
  6. 10. cholesterol build on the walls of arteries
  7. 12. finger-like projections on the cells that line the villi
  8. 14. upper chambers of the heart that receive blood from the body and lungs
  9. 15. thin structure that encloses all the contants of plant and/or animal cells
  10. 16. tiny blood vessels that connect arteries to veins
  11. 18. made of just one cell
  12. 21. work together
  13. 23. small finger-like projections on the inner surface of the small intestine that absorb nutrients
  14. 24. organelle that directs all the activities in a cell
Down
  1. 1. 2 main branches of the trachea that lead into the lungs
  2. 3. outer covering of a plant cell that provides strength and support
  3. 4. a thick-walled blood vessel that takes blood away from the heart
  4. 5. tubes that connect the bronchi to the air sacs in the lungs
  5. 8. large artery carrying blood from the left ventricle to the body
  6. 11. organelles that convert sunlight into food (plant cells only)
  7. 13. the basic unit of life
  8. 17. purpose or task diffusion the movement of particles of a substance from an area of high concentration to low concentration
  9. 19. waste removal
  10. 20. hair-like extensions that protrude from the surface of some uni-cellular organisms
  11. 22. tiny air-filled sacs in the lungs