Chap 26 crossword

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Across
  1. 2. Circulatory system where blood is confined within vessels.
  2. 7. Circulatory system where blood is not always confined to vessels.
  3. 9. Respiratory pigment found in many invertebrates.
  4. 10. Muscle that separates the thoracic cavity and aids in breathing.
  5. 12. Blood vessels that carry blood away from the heart.
  6. 13. Iron-containing molecule in red blood cells.
  7. 18. Blood cells involved in immune response.
  8. 19. Protein that helps in blood clotting.
  9. 20. Blood vessels that return blood to the heart.
Down
  1. 1. Protein in red blood cells that binds oxygen.
  2. 3. Type of circulation between the heart and lungs.
  3. 4. Process of moving air into and out of the lungs.
  4. 5. Fluid component of blood that carries cells and nutrients.
  5. 6. Smallest blood vessels where gas exchange occurs.
  6. 8. Blood cells responsible for oxygen transport.
  7. 9. Organ responsible for pumping blood throughout the body.
  8. 11. Blood vessels that carry blood to the lungs.
  9. 14. Primary organ for gas exchange in vertebrates.
  10. 15. Vessels that carry blood to the heart.
  11. 16. Process by which oxygen and carbon dioxide are exchanged.
  12. 17. Tiny air sacs in the lungs where gas exchange occurs.