Across
- 1. System, A system of vessels responsible for the movement of material through an organism.
- 5. muscles, move the ribs and thus change the volume of the thoracic cavity.
- 8. area of throat where food and air passages meet.
- 9. the muscular sheet of muscle separating the thorax and abdominal cavity of mammals.
- 11. The pigment molecule found in red blood cells. has a high affinity for oxygen.
- 14. the main transporting medium of a mammal body
- 16. the movement of particles from high to low concentration without the expenditure of energy.
Down
- 2. Wall contains semi-circular rings provide support in an open position at all times.
- 3. A very narrow blood vessel found between arteries and veins. part of a branching network that reaches to within a very small distance to every cell.
- 4. active movement of the passage of air over gas exchange surfaces.
- 6. diffuses out of the alveolus into red blood cells
- 7. Dioxide, Diffuses into the alveolus.
- 10. Filament, a thin-walled highly vascular structure arising from the gill arches of the gill of bony fish. a gas exchange surface.
- 12. A tiny air sac located on the end of a bronchiole
- 13. Division of trachea that leads to the lung.
- 15. The gas exchange structure of fish.