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Chapter 38: Q. 12 (page 1120)

Compact bone is composed of ________. a.

  1. trabeculae
  2. compacted collagen
  3. osteons
  4. calcium phosphate only

Short Answer

Expert verified

The correct answer is option (c).

Compact bone is composed of osteons.

Step by step solution

01

Osteons

  • An osteoclast-rich tissue creates osteons, which are cylindrical vascular tunnels.
  • The main structural component of a compact bone, or osteon, is made up of lamellae and Haversian canals.
  • The osteon is made up of a central canal called the osteonic and concentric rings of matrix called lamellae.
02

Step: 1 Explanation for Correct answer

  • Osteons or haversian systems that are compacted closely together make up compact bone.
  • Blood arteries in the osteonic canals run parallel to the long axis of the bone. . Thus, the option c is correct.
03

Step: 2 Explanation for wrong answer

  • Trabecular bone is a very porous, heterogeneous, and anisotropic substance that is present in the vertebral bodies and at the epiphyses of long bones. So, option a is wrong.
  • Triple helix structure makes up the collagen protein. So, option b is wrong as well.
  • Type I collagen makes up the majority of bone and is mineralized by calcium-phosphate crystals. Hence, option d is wrong too.

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