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Sharks - Skeleton. The skeleton of the shark has evolved and adapted to suit and aid the habitat, migration, hunting habits and diet of these acclaimed carnivores. Unlike terrestrial animals, humans, and even other marine animals, sharksâ skeletons are made purely of cartilage and connective tissue, or muscle. There is no bone. This type of skeleton means that the shark is lighter, as cartilage is about half the density of bone. This is important because, unlike other fish, the shark has no swim bladder to prevent it from sinking to the bottom of the ocean.
Animals can have internal or external skeletons-while some do not have a skeleton at all. Insects have an external skeleton made of chitin. Sharks have an internal skeleton made of cartilage, and humans have an internal skeleton made of cartilage and bone. Hinge joints and ball and socket joints are synovial joints.The biceps and triceps muscles act as an antagonistic pair to move the arm at the elbow.nsects have an external skeleton made of chitin. Sharks have an internal skeleton made of cartilage, and humans have an internal skeleton made of cartilage and bone. Hinge joints and ball and socket joints are synovial joints. The biceps and triceps muscles act as an antagonistic pair to move the arm at the elbow.