Question

Osteoid refers to:
A) The smallest bone of the body
B) The largest bone of the body
C) Young hyaline matrix of true bone in which calcium salts are deposited
D) Membranous ossification of cranium

Answer 1

Hint: Osteoid is the non-mineralized, organic portion of the bone matrix that forms prior to the maturation of bone tissue.

Complete Answer:
- The smallest bone of the body: stapes is the smallest bone out of the three small bones in the middle ear. It is 3 × 5 mm in size.
- The largest bone of the body: femur or the thigh bone is the largest bone of the body. It fits in the hip socket and connects down with the knee.
- Young hyaline matrix of true bone in which calcium salts are deposited: this makes up 50% of bone volume and 40% of bone weight. The deposit gets calcified after a few days.
- Membranous ossification of cranium: it forms osteoblasts which helps in growth and keeps growing until the approximate age of 25.

Hence, from the above analysis we can conclude that option C refers to Osteoid.

Note: Osteoid is a soft material, consisting of collagen, that is secreted by osteoblasts and constitutes the uncalcified matrix of bone, that is the osteoid.