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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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Most popular questions from this chapter

Which of the following statements about muscle contraction is true?

  1. The power stroke occurs when ATP is hydrolyzed to ADP and phosphate.
  2. The power stroke occurs when ADP and phosphate dissociate from the myosin head.
  3. The power stroke occurs when ADP and phosphate dissociate from the actin active site.
  4. The power stroke occurs when Ca2+ binds the calcium head.

The cells responsible for bone resorption are ________.

  1. osteoclasts
  2. osteoblasts
  3. fibroblasts
  4. osteocytes

How would muscle contractions be affected if ATP was completely depleted in a muscle fiber?

What effect will low blood calcium have on neurons? What effect will low blood calcium have on skeletal muscles?

Which of the following is not a true statement comparing exoskeletons and endoskeletons?

  1. Endoskeletons can support larger organisms.
  2. Only endoskeletons can grow as an organism grows.
  3. Exoskeletons provide greater protection of the internal organs.
  4. Exoskeletons provide less mechanical leverage.
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