You take X-rays of two individuals. Ray has been a weight lifter and body builder for 30 years; Ben has led a mostly sedentary life. What differences would you expect in their X-rays? a. No difference, they would both have thicker bones than a younger person due to natural thickening with age. b. No difference, lifestyle does not affect bone density. c. Ray would have thicker bones due to reshaping as a result of physical stress. d. Ben would have thicker bones because bone accumulates like fat tissue from a sedentary lifestyle.

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A:

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Tissue regeneration & repair

Tissue regeneration involves the restoration of tissue components by regrowth of damaged tissues. In contrast, tissue repair involves patching of injured tissue rather than restoring it. It is the proliferative capacity of the cells that decides the amount of regeneration against the repair that would occur in the tissue. Both regeneration and repair depending on the duration of the injury and response to the inflammation.