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Dogfish sharks, like other sharks, have a unique buoyancy system primarily due to their large livers, which are filled with oil. This oil is less dense than water, helping to counteract their weight and providing neutral buoyancy. Their cartilaginous structure also contributes to their ability to maintain buoyancy while swimming. Overall, these adaptations allow dogfish sharks to navigate efficiently in their aquatic environment.
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Since you categorize this question under Frog and Toads, I presume you mean a frog liver. I've added a link to the answer under related links. Check it out.
Sharks are slightly heavier than water, so they naturally tend to sink. Buoyancy or lift is provided in two ways. First, sharks store large quantities of oil in their liver. Because oil is less dense than water, storing this oil decreases the overall density of the shark, and increases its buoyancy. Second, as a shark swims, its pectoral fins provide lift, in much the same way the wings of an airplane does. If a shark stops swimming it will sink, but its stored oil and relatively light skeleton help it to float and decreases the amount of energy that must be expended on swimming.Read more: Sharks - Locomotion And Buoyancy - Water, Oil, Caudal, and Swimming - JRank Articles http://science.jrank.org/pages/6112/Sharks-Locomotion-buoyancy.html#ixzz2S6ZbwMcg
the brain is smaller in the shark
The liver in a dogfish shark acts as a storage site for fats, oils, and other nutrients. It also helps with buoyancy control by regulating the shark's lipid content. Additionally, the liver plays a role in detoxifying waste products in the shark's body.
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Liver is much larger in sharks as compared to stomach.Liver not only helps in buoyancy but also keeps shark upright. there are other factors which are also involved in buoyancy.
Buoyancy
The largest parts of the shark's nervous system are the brain, the spinal cord, and the neurons.Mostly the brain though.
I like turtles