Biology Crossword

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Across
  1. 3. Tiny cells that help in blood clotting
  2. 4. An undifferentiated cell that can divide to form specialized cells
  3. 7. protects your lungs from damage
  4. 9. long, thin cells with fine branches at the ends capable of conducting electrical impulses.
  5. 10. The organ system that takes in and breaks up food and then excretes the waste.
  6. 11. 206 of these in the human body
  7. 12. the biggest organ in the body, covers out muscles
Down
  1. 1. Organ system made up of the heart, the blood and the blood vessels. This system transports oxygen and nutrients and carries away wastes.
  2. 2. Thin-walled blood vessels that allow the exchange of nutrients and wastes between blood and body tissues
  3. 5. inside your chest protected by ribcage, produces air for the body.
  4. 6. clusters of air sacks in the lungs.
  5. 8. grows of the top of your head