Question

Select the incorrect statement regarding the bone or osseous tissue.

• A. Matrix of bone is formed by organic matter only.
• B. Long bones have a marrow cavity which is filled with a neurovascular tissue called bone marrow.
• C. Bone is externally covered by a thick sheath, called periosteum.
• D. Matrix of bone is arranged in concentric rings, called Haversian lamellae.

Answer 1

The correct option is A Matrix of bone is formed by organic matter only.

Bone matrix is synthesized by a layer of osteoblasts on the bone surface. The osteoblasts are mesenchymal in origin and characterized by their abundant endoplasmic reticulum and their production of the enzyme alkaline phosphatase. Bone matrix is a composite material consisting of organic and inorganic components. The organic matrix makes up ∼20% of the wet weight of bone and is comprised primarily of collagen. Individual collagen fibrils are then spontaneously grouped together to create a collagen fiber.
So, the correct option is option A.