Shark skeleton system is made up of cartilages.

Introduction:
The skeleton system of a shark is quite different from that of other vertebrates. Instead of bones, sharks have a skeletal structure made up of cartilages, which are flexible and lightweight. This unique adaptation allows sharks to navigate through water with agility and speed.

Cartilages:
Cartilage is a type of connective tissue that is firm, yet flexible. It provides support and shape to various parts of the shark's body. Unlike bones, which are rigid, cartilages can bend and flex, allowing sharks to move their bodies and swim efficiently.

Composition and Function:
Shark cartilages are composed of cells called chondrocytes, which are embedded in a matrix of collagen fibers. This composition gives cartilage its strength and elasticity. The cartilages in a shark's skeleton system serve several important functions:

1. Support: The cartilages provide structural support to the shark's body, allowing it to maintain its shape and swim effectively.

2. Flexibility: The flexible nature of cartilages enables the shark to move its body and tail in a smooth, undulating motion, essential for swimming.

3. Lightweight: Compared to bones, cartilages are lighter, which is advantageous for a marine animal like a shark. It reduces the overall weight of the shark's body, making it easier for them to float and swim.

4. Shock absorption: Cartilages absorb and distribute the forces generated during swimming and feeding, protecting the internal organs and preventing any damage.

5. Growth and repair: Cartilage has the ability to grow and repair itself, allowing sharks to adapt to changes in their environment and heal injuries over time.

Conclusion:
In conclusion, the skeleton system of a shark is made up of cartilages. These flexible and lightweight structures provide support, flexibility, and shock absorption, allowing sharks to navigate through water with precision and efficiency. The adaptation of cartilages in the shark's skeleton system is a remarkable example of nature's ingenuity in creating diverse and well-suited organisms.

Shark's skeleton is made up of cartilage