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There are two pieces to this question: a) How does bone resorption (movement of Ca/Phos out of bone into the blood) result in net improvement in bone structure? Bones are constantly remodeling, primarily in response to mechanical stressors. Although you clearly already realize this, I will make it explicit: osteoblasts are the cells that create new bone; ...


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I contacted Richard Pillans, the primary author of the article linked to in the question. He told me that he did not know whether the rectal gland was reduced. Researchers are hesitant to capture and dissect the freshwater sharks because of their endangered status.   He did tell me that they have gathered much more data on the movement of the sharks since ...



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