A gymnastics student lands awkwardly and hurts her ankle. After MRI scan, it was revealed that she has a torn cartilage. The health care worker states it may take up to 3 to 4 months for this injury to heal. The basic physiologic reason behind the prolonged recovery is due to the fact that cartilage is/has primarily:
A) The main secretor of an extracellular matrix
B) Avascular
C) Low tensile strength
D) Lacking minerals
Ans: B
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Cartilage is avascular tissue, a fact that stands in contrast to bone tissue. Both bone and cartilage contain cells that secrete an extracellular matrix, which forms the structure of the tissue. Cartilage is more flexible than bone, but it also exhibits considerable tensile strength. Cartilage repair is a particularly slow process and may in fact not occur in some cases. In contrast to cartilage, the extracellular matrix of bone is mineralized, producing a hard tissue capable of providing support for the body and protection for its vital structures.
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