Sharks

Great White Sharks Teeth The great white shark has 3,000 teeth at any one time. They are triangular, serrated (saw-edged), razor-sharp, and up to 3 inches (7.5 cm) long. The teeth are located in rows which rotate into use as needed. The first two rows are used in obtaining prey, the other rows rotate into place as they are needed. As teeth are lost, broken, or worn down, they are replaced by new teeth that rotate into place. Great White Sharks Teeth

Shark Anatomy 1.Liver 2.Spiral valve 3.Heart 4.Pancreas 5.Stomach 6.Eye 7.Nostril 8.Ampullae of Lorenzini 9.Teeth 10.Pectoral Fin 11.Pelvic Fin 12.Anal Fin 13.Caudal or Tail Fin 14.Second Dorsal Fin 15.First Dorsal Fin 16.Gills Skeleton The bones of a fish are made mostly of calcium, but a shark doesn't really have any bones. A shark skeleton is made of cartilage. Bony fish have a gas-filled swim bladder which enables them to float in the water, but sharks have no such bladder. Since cartilage is lighter than bone, it helps to keep a shark from just sinking to the bottom of the ocean. A shark doesn't have as many moveable parts as a bony fish, which in some ways makes a shark a little more clumsy. But cartilage is more flexible than bone, so a shark can turn around in a smaller space than a bony fish. Sharks keep growing cartilage as long as they live, and have extra mineral deposits in their jaws where they need extra strength, (the better to bite you with). Shape W...