Across
- 6. when B cells activate and divide they produce
- 8. liquid part of blood
- 9. pseudocoelmate invertebrates use this fluid of their body cavity to transport
- 10. specialized system in which pumping heart moves blood in specific directions
- 11. all animals must maintain this balance in their bodies
- 14. gas exchange in slugs and snails
- 15. the circulating fluid of animals with an open circulatory system
- 16. least numerous WBC
Down
- 1. vessels that carry blood away from heart
- 2. most aquatic invertebrates carry out gas exchange with
- 3. This cavity supplies nutrients for all body cells lining the cavity
- 4. in this system the blood circulates in the confines of tubular vessels
- 5. in this system the heart pumps hemolymph out into the body cavity
- 6. circuit that supplies blood only to lungs
- 7. carry blood to heart
- 8. small with high surface-area-to-volume ratio
- 12. reddish pigment that contains iron as the oxygen-binding metal
- 13. internal sac shaped respiratory organ