Protein present in cartilage and bone is

A. Chondrin and ossein respectively

B. Chondroitin sulfate

C. Cartilagein

D. None of the above

• Cartilage contains a bluish-white, gelatin-like substance called Chondrin. It is a protein–carbohydrate matrix that embeds cartilage cells and provides flexibility. In contrast, bones contain collagen proteins known as Ossein. The combination of collagen (ossein) and calcium salts gives bones their strength and elasticity to withstand stress.
• Bone is made up of different types of cells such as osteoblasts, osteocytes, and osteoclasts. Cartilage, on the other hand, consists of specialized cells called chondrocytes, which produce an extracellular matrix (ECM) rich in proteoglycans and elastin fibers.
• Thus, cartilage has chondrin, and bone has ossein.
• Therefore, the correct answer is Option A: Chondrin and Ossein respectively.

Additional Information:

1. Types of Cartilage – Hyaline, Elastic, and Fibrous (differ in structure, function, and arrangement of cells).
2. Types of Bone –
   • Cortical bone: Dense and compact, forming the outer layer.
   • Trabecular bone: Spongy, honeycomb-like, making up the inner layer.

Final Answer: The correct option is Chondrin in cartilage and Ossein in bones.