Bones are made up of:

Calcium:
Calcium is the main mineral present in bones. It plays a crucial role in providing strength and structure to the bones. About 99% of the body's calcium is stored in the bones and teeth. Calcium helps in the formation and maintenance of healthy bones throughout life. It is essential for bone growth, development, and repair.

Other minerals:
Apart from calcium, bones also contain other minerals such as phosphorus, magnesium, and fluoride. These minerals contribute to the overall strength and density of bones.

Collagen:
Collagen is a protein that forms the framework of bones. It provides flexibility and resilience to the bones, making them less prone to fractures. Collagen acts as a scaffold for minerals like calcium to bind to, forming a strong and durable structure.

Bone cells:
Bones are not just made up of minerals and proteins, but they are also living tissues. Specialized cells called osteoblasts and osteoclasts are responsible for the growth, maintenance, and repair of bones. Osteoblasts are involved in the formation of new bone tissue, while osteoclasts are responsible for breaking down and remodeling bone.

Bone marrow:
The inner part of bones contains a soft, spongy tissue called bone marrow. Bone marrow is responsible for the production of blood cells, including red blood cells, white blood cells, and platelets. It also plays a crucial role in the immune system.

Conclusion:
In conclusion, bones are made up of calcium, other minerals like phosphorus and magnesium, collagen, bone cells (osteoblasts and osteoclasts), and bone marrow. These components work together to provide strength, structure, flexibility, and the ability to produce blood cells.

Bones are made up of calcium and phosphorus