Flexi Says: Sharks cells are adapted to live in the concentrated salt solution of the ocean. Instead of drinking water, the shark absorbs some seawater through their gills. They have salt glands for excreting excess salts. They also do not urinate through a traditional urinary system. Instead, they convert the urine into urea that is stored in the bloodstream, the excess of which is absorbed in the muscle tissue and expelled through their skin. If moved to fresh water, the water will move through the skin and into the cells to dilute their contents, killing the shark.
