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Sharks have gills on either side of their head. Since the sharks can only use their nose for smelling, gills provide them a passage for them to breathe by absorbing oxygen from the water.vignette4.wikia.nocookie.net
A sharks liver takes up a lot of internal space. It helps with digestion like another animal's would, however, it had many other functions as well. Oil is secreted from the liver which helps sharks stay buoyant ( a float) under water. This oil is not only helpful to sharks but can also be used in cancer treatments. The liver stores fatty reserves and also energy.i.imgur.com
Creates red blood cells and is one of the main parts of a sharks immune system.
Pumps blood throughout the body. Made up of cavities like the atrium and sinus venosusbio.sunyorange.edu