| A | B |
|---|
| nictitating membrane | 3rd eyelid |
| lateral line | row of pitted scales sensing water movement |
| spiracle | openings to allow breathing when mouth is closed |
| placoid scales | provide the sand paper feel |
| ampullae of Lorenzini | electrical sensors |
| claspers | only on male sharks |
| pectoral fins | provide lift and turning ability |
| gill filaments | where gas exchange occurs |
| gill slits | allows water and carbon dioxide to exit |
| cloaca | shared opening for feces, urine and gametes |
| dorsal fins | fins providing stability |
| caudal fin | extra long in the thresher shark |
| gall bladder | green sac under liver |
| rectal gland | finger-like pouch, excretes salt |
| spleen | triangular in shape, helps immunity |
| spiral vavle | increases surface area in the intestine |
| stomach | J-shape, has rugae folds, digests food |
| liver | 3 lobes, makes bile |
| heart | has an atrium and ventricle |
| pelvic fins | paired fins, posterior, helps with balance |
| teeth | replaced continuously, not all are sharp |
| pancreas | supplies digestive enzymes |
| cartilage | like bone but not bone |
| brain | cerebrum, cerebellum, medulla, olfactory and optic lobes |
| mermaid's purse | egg case |
