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MCAT Question A Day - 7/18/13 - Answer!

When skeletal muscles grow and place extra stress on bones as a result of weight training, bones respond by increasing in thickness. This is most likely due to the action of

A.  osteoblasts.
B.  osteocytes.
C.  osteoclasts.
D.  motor neurons.

The correct answer is (A). Only osteoblasts make new bone tissue. Osteoclasts break down bone tissue, while osteocytes maintain healthy bone tissue that is already present. Motor neurons stimulate muscle cells to contract and are not directly relevant to the question.