711. Elasticity of periodontal ligament is due to:
A. Presence of elastic fibers.
B. Presence of oxytalan fibers.
C. Wavy coarse of collagen fibers.
D.Non of the above.

712. The principal fibers of periodontal ligament are:
A. Elastic.
B.Oxytalan.
C. Collagen.
D.Precollagen.

713. Function of oxytalan fibers:
A. Support nerves.
B. Support blood vessels.
C. Help fibroblasts migration.
D. All of the above.

714. Open faced nucleus is found in:
A.Resorptive cells.
B. Synthetic cells.
C. Defensive cells.
D. Progenitor cells.

715. The periodontal ligament is formed of:
A. Cells only.
B. Fibers only.
C. Ground substances only.
D. All of the above.

716. The protective function of periodontal ligament is achieved by its:
A. Fibers.
B. Blood vessels.
C. Nerves.
D. All of the above.

717. Which of the following best describes the alveolar bone proper?
A.It is composed of lamellar bone only.
B.It is composed of bundle bone and lamellar bone.
C.It is composed entirely of bundle bone.
D. It is composed of spongy bone only.

718. The alveolar bone proper is composed of:
A. Spongy & woven bone.
B. Bundle & lamellar bone.
C. Compact bone only.
D. Compact & spongy bone.

719. Which of the following is true:
A. Normal long bone contains woven bone.
B. Reversal lines represent rhythmic apposition of bone.
C. Growth line of bone disappears at 5 years.
D.Lamellated bone contains resting lines.

NOTE
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