Across
- 2. A rod of tough, flexible material that runs the length of a creatures' body, providing support.
- 5. Blood vessels that carry blood away from the heart.
- 6. A circulatory system in which the oxygen-carrying blood cells never leave the blood vessels.
- 7. Segments of bone or some other hard substance that are arranged to provide support.
- 8. What subphylum contains creatures that have a notochord through the larva stage and it actually disappears in the adult stage of life.
- 11. A skeleton on the inside of the body, composed of bone and cartilage.
- 13. The portion of the skeleton that attaches to the axial skeleton and has the imbs attached to it.
- 15. Cells that continue to produce new bone tissue as the bones grow and reshape as the vertebrates grow.
- 16. Lacking an internal mechanism for regulating body heat
- 19. The portion of the skeleton that supports and protects the head, neck, and trunk
- 20. What controls the nervous system.
Down
- 1. The lobes of the brain that receive signals from the receptors in the nose.
- 3. Cells that promote the formation of bone tissue by producing the bone matrix.
- 4. Are mature bone cells that are surrounded by the bone matrix.
- 6. The lobes of the brain that integrate sensory information and coordinate the creature's response to that information.
- 9. Blood vessels that carry blood back to the heart.
- 10. What subphylum includes the organisms that have notochords throughout life.
- 12. The lobe that controls involuntary actions and refines muscle movement.
- 14. What subphylum includes vertebrates that have a notochord during early development and then turns into a true backbone before the animals are born or hatched.
- 17. Tiny, thin-walled blood vessels that allow the exchange of gases and nutrients between the blood and the cells of the body.
- 18. The lobes of the brain that receive signals from the receptors in the eyes