Cells Crossword

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Across
  1. 2. These produce proteins.
  2. 4. This is an organ system that involves the lungs.
  3. 5. These stop the blood from flowing the wrong way.
  4. 7. This is where photosynthesis occurs.
  5. 8. This pumps blood around the body.
  6. 10. This is where gas exchange occurs.
Down
  1. 1. This filters the blood.
  2. 3. These are blood vessels that are one cell thick.
  3. 5. These carry the blood towards the heart.
  4. 6. This is where water and sap is stored.
  5. 9. These are made up of specialised cells working together.