| 1)vertebrae | small bones making up the backbone |
| 2)cranium | bony protection covering the brain |
| 3)agnatha | class containing hagfish & lampreys |
| 4)chondrichthyes | class containing sharks & rays |
| 5)osteichthyes | class of bony fish |
| 6)arches | bony supports for the gills |
| 7)lateral | line system that detects vibrations in the water |
| 8)hagfish | jawless marine fish that feed on dead fish |
| 9)lamprey | jawless and sometimes parasitic fish |
| 10)external | fertilization in jawless fish |
| 11)cartilage | flexible protein material in the skeleton of sharks |
| 12)placoid | toothlike scales on sharks |
| 13)pectoral | fins on sharks that appear like wings of an airplane |
| 14)olfactory | responsible for the shark’s acute sense of smell |
| 15)ray | flattened bat like fish with a skeleton of cartilage |
| 16)slits | openings into the gills on cartilagenous fish |
| 17)claspers | modified pelvic fins of male sharks used to transfer sperm |
| 18)perch | example of a ray finned fish |
| 19)operculum | bony covering over the gills of bony fish |
| 20)caudal | tail fin |
| 21)liver | organ that secretes bile to digest fats |
| 22)arteries | carry blood away from the heart |
| 23)veins | return blood to the heart |
| 24)atrium | heart chamber that receives blood bck form the heart |
| 25)ventricle | pumping chamber of the heart |
| 26)countercurrent | movement of blod across a fish’s gills for maximum absorption of oxygen |
| 27)buoyancy | property that the swim bladder gives to a fish |
| 28)cerebrum | forebrain |
| 29)cerebellum | hindbrain |
| 30)spawing | reproductive behavior where fish build nests and lay their eggs |
