Question

After burn, what does dry bones possess?
A) Matrix lacunae, canaliculi, canals & marrow cavity
B) Living cells osteocytes
C) Only minerals
D) Only osteocyte & matrix

Answer 1

Hint: Human bones square measure created from a collagen-rich matrix that contains phosphate and alternative minerals. Calcium phosphates square measure inorganic mineral salts that structure nearly sixty fifth of the bone mass. The extreme heat of burning vaporizes the organic matter of the body whereas the inorganic matter in the bones remains.

Complete answer:
The bones are made up of organic matter called the collagen and the inorganic minerals like calcium and phosphate. The minerals provide hardness, rigidity and compressive strength to the bone. The collagen fibres in the bone provide elasticity, little compressive strength and high intrinsic strength to the bones.
The burning of dead remains is followed by several religions as a means of cremation. When a body is burned, the skin dissolves after which the tissues and fat disintegrate. The organic matter like the collagen is burned leaving behind the inorganic minerals like calcium and phosphates behind.

Matrix lacunae, canaliculi, canals & marrow cavity- It contains the blood vessels and fluids which is organic matter. It gets converted into ashes on burning.

Living osteocytes- These are the cells present in the bone. They live as long as the bone survives. They also help in bone regeneration.

Hence, the correct answer is option (C).

Note: The function of osteocytes is to respond to the strain. It sends signals for bone formation and resorption to the bone surface. It also helps in maintaining the mineral homeostasis of the bone.