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What is Cartilage?

Cartilage Definition Biology  - Cartilage is the connective tissue that forms the skeleton of the mammalian embryos before the formation of the bone begins. And persisting in the part of the human skeleton in adulthood. It is the only component of the skeleton found in some of the certain primitive vertrbrates, including sharks and lampreys. Cartilage is made of a dense network of collagen fibres embedded in a firm gelatinous ground substance having the consistency of plastic. The structure of the tissue gives tensile strength and it also enables the cartilage to bear weight while retaining greater flexibility than bone.


Mention the Types of Cartilage Tissue and Give the Functions of Cartilage

Elastic Cartilage - 

Its main function is to provide support and maintain the shape of flexible body parts like the ear and larynx.

 

Hyaline Cartilage - 

It is one of the most abundant types of cartilage found in the human body. This cartilage is smooth, transparent and glassy and it coats at the ends of the body surface, to reduce the friction in the joints. This type of cartilage is more commonly known as articular cartilage. 


Fibrocartilage - 

This type of cartilage is flexible, tough and provides cushioning in the joints. For example, the knee joint is made of half-moon-shaped fibrocartilage. And also our hip and the shoulder joints have ring-shaped labrum that provides cushioning. Fibrocartilage will absorb one-third of the joint impact load but it is not as smooth as hyaline cartilage that coats the bones themselves. 

Cartilage Cells

The important cell in the cartilage cell is chondrocytes. The ground substances of the cartilage are chondroitin sulfate, and the fibrous sheath is called perichondrium. Cartilage cells receive nutrition by diffusion through the gel.

 

Where is Cartilage found? 

It is a type of connective tissue found in the human body. At the time of development embryo cartilage is a precursor to bone cartilage. Some of the cartilage remains while the other gets dispersed throughout the body, especially to cover the joints and cartilage also composes most of the outer ear.


Role of Cartilage in Human 

The important role of the cartilage in the human body is to form a model for the later growth of a scaly skeleton. Some of the parts of the skull like the clavicle and collarbone are performed in the cartilage. In the embryo, cartilage hardens by deposition and then chondrocytes are replaced by bone cells or osteocytes. A thin plate of cartilage, called the epiphyseal plate, remains at the end of growing bones after birth, and finally, cartilage hardens itself once the bone behind it has completed its growth.  chondrocytes continue to grow and divide at the growing edge of the plate. And at the trailing edge they are replaced by osteocytes as new bone is laid down, in the bone cartilage, cartilage remains of a constant thickness while the bone grows behind it. Once the plate gets disappeared, then further no longitudinal bone growth is possible.

 

Do You know? 

What is the composition of cartilage in the human body? After going through what is cartilage? We understood cartilage is tough but flexible tissue, which contains around 65 - 80 per cent of water. Although the quantity of water decreases in the older people and the rest of the percentage contains the gel-like substance known as matrix, it gives its form and function.


How to learn the Concept of Cartilage- Definition, Types, Structure, Role and FAQs?

It can be a little difficult to learn the concept of Cartilage- Definition, Types, Structure, Role and FAQs in the beginning. As an important concept of biology, the Cartilage- Definition, Types, Structure, Role and FAQs require a lot of your time and attention. However, Vedantu makes it all easy for you. You can use the study materials available at Vedantu that will assist you in the learning process and make you more efficient. We provide detailed explanations of all the topics covered in Cartilage- Definition, Types, Structure, Role and FAQs. We have made all these study resources available for free for all the students around the globe.

Here are some other tips to help you learn the concept of Cartilage- Definition, Types, Structure, Role and FAQs: 

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  • Learn the meaning of cartilage and why is it important for the human body. If you understand its meaning and importance, it will be easier to understand the entire concept. 

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Importance of learning the Concept of Cartilage- Definition, Types, Structure, Role and FAQs

The concept of Cartilage- Definition, Types, Structure, Role and FAQs is quite important to learn for all biology students. With this topic, you can learn more about the functioning of the human body. Cartilage- Definition, Types, Structure, Role and FAQs will teach you the role of cartilage in our body and why is it important. By learning this concept, you will get to know more about joints and bones as well. Moreover, the Cartilage- Definition, Types, Structure, Role and FAQ is one of the crucial concepts of the biology syllabus that carries a good portion of the marking distribution. So, if you go through the Cartilage- Definition, Types, Structure, Role and FAQs thoroughly, you can improve your chances of scoring the highest marks in your class. To start learning, you can use Vedantu’s e-learning platform and gain more knowledge about this concept.

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FAQs on Cartilage

1. What is cartilage and what are its main components?

Cartilage is a specialised, flexible connective tissue found in many areas of the body. It is semi-rigid yet flexible, providing support and cushioning. Its main components are specialised cells called chondrocytes, which are embedded in an extensive extracellular matrix. This matrix is composed of collagen fibres, elastin fibres, and a gel-like ground substance rich in proteoglycans.

2. What are the primary functions of cartilage in the human body?

Cartilage performs several critical functions in the body, including:

  • Reducing Friction: It covers the surfaces of bones at joints, allowing them to glide over one another with very little friction.
  • Providing Support: It gives shape and support to structures like the nose, ears, and trachea, keeping them firm but flexible.
  • Shock Absorption: It acts as a cushion in joints like the knee and between the vertebrae in the spine, absorbing impact and pressure.
  • Skeletal Framework: In embryos, the entire skeleton is initially made of cartilage, which acts as a template for future bone development.

3. What are the different types of cartilage and where can each be found in the body?

There are three main types of cartilage, each with a different structure and location based on its function:

  • Hyaline Cartilage: This is the most common type. It is smooth and glass-like, found on the articular surfaces of bones, at the ends of ribs, and in the nose, larynx, and trachea.
  • Elastic Cartilage: Similar to hyaline cartilage but contains more elastin fibres, making it highly flexible. It is found in the external ear (pinna) and the epiglottis.
  • Fibrocartilage: This is the strongest type of cartilage, with thick bundles of collagen fibres. It is excellent at resisting compression and is found in the intervertebral discs, the pubic symphysis, and menisci of the knee.

4. What are the specialized cells of cartilage called, and what is their role?

The specialized cells of cartilage are called chondrocytes. Their primary role is to produce and maintain the cartilaginous matrix that surrounds them. This matrix is what gives cartilage its unique properties of strength and flexibility. Chondrocytes reside in small spaces within the matrix known as lacunae.

5. Can damaged cartilage, for instance in the knee, heal on its own?

No, cartilage has a very limited ability to heal on its own. This is because it is avascular, meaning it does not have its own blood supply. Nutrients and oxygen must diffuse through the matrix to reach the chondrocytes, and waste products must diffuse out. This slow process severely restricts its capacity for self-repair after damage, which is why cartilage injuries are often permanent without medical intervention.

6. How does the structure of cartilage differ from that of bone?

While both are connective tissues, cartilage and bone have key differences. Cartilage has a flexible, gel-like matrix and is avascular (no blood vessels). In contrast, bone has a rigid, calcified matrix infused with minerals like calcium phosphate, making it hard and strong. Bone is also highly vascular, meaning it has a rich blood supply, which allows it to heal much more effectively than cartilage.

7. Why is cartilage essential for the development of the skeleton in an embryo?

In the embryonic stage of development, the skeleton is not made of bone but is first laid down as a framework of hyaline cartilage. This cartilage model provides a flexible template that can grow rapidly. As the fetus develops, this cartilage is gradually replaced by bone through a process called ossification. This process is crucial for forming a strong, rigid skeleton from a flexible foundation.