What Is The Largest Organ In The Shark?

Discover the largest organ in sharks and its crucial role in their survival. Dive into the fascinating world of the shark's liver and its significance in the depths of the ocean.

Did you know that sharks have an organ that accounts for a whopping 12% of their total body weight? It may come as a surprise, but the largest organ in the shark is its liver. This incredible organ plays a crucial role in maintaining the shark’s buoyancy, allowing it to effortlessly navigate through the depths of the ocean. Let’s explore the fascinating world of the shark’s liver and uncover why it holds such significance in their survival.

Integumentary System

The largest organ in sharks is the integumentary system, which includes the skin. The shark’s skin is not only the largest organ, but it also serves several important functions. One of the primary functions of the skin is protection. The tough, leathery skin acts as armor, shielding the shark from potential injuries and attacks. Furthermore, the skin provides a barrier against infections and parasites, ensuring the shark remains healthy.


The epidermis is the outermost layer of the shark’s skin. It is made up of a tough, waterproof barrier that helps the shark retain moisture and maintain its internal balance of fluids. The epidermis also serves as the first line of defense against pathogens and harmful environmental factors. In addition to its protective role, the epidermis contains pigment cells called chromatophores, which give sharks their various skin colors and patterns.

Dermal Denticles

Dermal denticles are small, tooth-like scales that cover the shark’s skin. These denticles play a crucial role in the shark’s hydrodynamics, enabling it to swim efficiently through the water. The denticles have a streamlined shape, reducing drag and turbulence as the shark moves. This adaptation allows the shark to glide effortlessly through the water, conserving energy and enhancing its ability to catch prey.

Dermal Dentine

Dermal dentine is another component of the shark’s integumentary system. It is a unique type of dentin that forms a layer underneath the skin. Dermal dentine contributes to the shark’s overall strength and rigidity, providing additional support to the body. This specialized dentine also helps protect the shark’s internal organs and contributes to its overall structural integrity.

See also  Do Sharks Jump Out Of The Water Like Dolphins?


While not part of the integumentary system, the gills are another essential organ in sharks. They are responsible for the shark’s respiration, allowing it to extract oxygen from the water. The gills consist of specialized structures that extract oxygen molecules from the water as it passes over them. These structures, called gill filaments, are lined with tiny blood vessels, optimizing the absorption of oxygen and the removal of carbon dioxide.

Digestive System

The digestive system of a shark is highly efficient, allowing it to process a wide variety of prey. This system starts with the mouth, where the teeth play a vital role in capturing and tearing apart the prey. Once the prey is in the mouth, it is swallowed whole or bitten into smaller pieces, depending on the size. From here, the prey enters the stomach, where powerful acids and enzymes break it down further.


The liver is a significant organ in the shark’s digestive system, both in terms of size and function. It is responsible for producing bile, a substance that aids in the digestion and absorption of fats. The liver also stores nutrients and helps regulate the shark’s metabolism. In some shark species, like the whale shark, the liver can occupy a significant portion of the body cavity, highlighting its importance in their physiology.


The stomach is where most of the chemical digestion takes place in sharks. The powerful acids and enzymes secreted by the stomach break down the proteins and other nutrients present in the prey, preparing them for absorption. The stomach’s muscular walls also aid in mixing and churning the food, further facilitating the digestion process. Once the food is adequately broken down, it moves on to the next part of the digestive system, the intestines.


The intestines are the final part of the shark’s digestive system. They are responsible for absorbing the broken-down nutrients from the digested food and transporting them into the bloodstream. The intestines contain various specialized structures, such as villi and microvilli, which increase the surface area available for absorption. This allows the shark to extract as many nutrients as possible from its prey. Any undigested materials are eliminated from the body through the anus.

See also  How Many Great White Sharks Are Killed Each Year?

In conclusion, the largest organ in sharks is the integumentary system, encompassing the skin. The skin provides protection, aids in hydrodynamics through dermal denticles, and possesses the epidermis and dermal dentine. Alongside the integumentary system, the gills are responsible for respiration, while the digestive system plays a crucial role in processing prey. The liver, stomach, and intestines are integral components of the digestive system, ensuring efficient digestion and nutrient absorption. Understanding the importance and functions of these organs in sharks helps us appreciate the remarkable adaptations that allow these magnificent creatures to thrive in their aquatic habitats.