Mechanical stress of bones, such as that caused by weight lifting, is detected by
A. osteoclasts, which then communicate to osteocytes to increase the size of lacunae.
B. osteoblasts, which then communicate to osteocytes and osteoclasts to deposit more hydroxyapatite.
C. chondrocytes, which then trigger osteoblasts to increase bone in a lengthwise fashion.
D. osteocytes, which then communicate to osteoblasts to increase synthesis of osteoid.
Answer: D
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