1. Bone tissue is also called _______________ tissue.

2. The skull, spinal column, and thoracic cage make up the _______________division of the skeleton.

3. By shape, most cranial bones, the sternum, and the scapulae areclassified as _______________ bones.

4. The two types of bone are _______________ bone, which forms the surface ofall bones, and _______________ bone, found within the bodies of the vertebrae and heads of the longbones, for example.

5. In life, a bone is covered with a very tough fibrous sheathcalled the _______________.

6. The bone-forming cells that synthesize its matrix and laterbecome trapped in it are called _______________.

7. Most lamellae of compact bone are concentrically arranged arounda space called the _______________.

8. Blood is produced in a tissue of the skeletal system called the_______________.

9. Most bones of the embryo develop from cartilage models by aprocess called _______________.

10. During the process in question 9, chondrocytes in the zone of_______________ enlarge and the walls of matrix between their lacunae become very thin.

11. The growth zone of a child's long bones–a cartilaginous platebetween the shaft and head of the bone–is called the _______________.

12. Bone deposition requires that the combined calcium and phosphateconcentrations in the extracellular fluid at least reach a critical level called the _______________.

13. A deficiency of calcium in the blood, called _______________, can lead tosustained muscle contractions called _______________.

14. Calcium homeostasis in adults is maintained almost entirely bythe secretion of _______________, which regulates the activity of bone-dissolving cells called _______________.

15. The most common adult bone disease, especially amongpostmenopausal white women, is _______________.

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