Quiz: Introduction to the Skeletal System

1. The human skeleton system accounts for about 50 percent of the body weight.
   True False
2. The skeleton protects the soft body parts. The fused bones of the cranium surround the brain to make it less vulnerable to injury.
   True False
3. When blood calcium levels decrease below normal, calcium is released from the bones so that there will be an adequate supply for metabolic needs.
   True False
4. Red marrow functions in the formation of red blood cells only.
   True False
5. An osteon consists of a central canal called the haversian canal, which is surrounded by concentric rings of matrix.
   True False
6. Compact bone consists of plates and bars of bone adjacent to small, irregular cavities that contain red bone marrow.
   True False
7. Intramembrane ossification involves the replacement of hyaline cartilage with bony tissue.
   True False
8. Even though bones stop growing in length in early adulthood, they can continue to increase in thickness or diameter throughout life in response to stress from increased muscle activity or to weight.
   True False
9. Long bones are primarily compact bone but may have a large amount of spongy bone at the ends or extremities.
   True False
10. Short bones consist primarily of spongy bone, which is covered by a thin layer of compact bone.
    True False