respiratory system gas exchange

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Across
  1. 3. – Tiny air sacs in the lungs where gas exchange occurs.
  2. 4. – Tiny blood vessels where gas exchange occurs.
  3. 7. – Cells that control the opening and closing of stomata.
  4. 10. – Process in plants that produces oxygen using sunlight.
  5. 12. – Red pigment in blood that carries oxygen.
Down
  1. 1. – Small openings on arthropods' bodies used for breathing.
  2. 2. – Muscle that helps in breathing by moving air in and out.
  3. 5. – Windpipe that connects the throat to the lungs.
  4. 6. – Process of using oxygen to produce energy in cells.
  5. 8. – Tiny openings on plant leaves where gas exchange happens.
  6. 9. – Movement of molecules from high to low concentration.
  7. 11. – Organs in fish that extract oxygen from water.