6.a Low blood [Ca++] triggers parathormone [PTH] release.
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6.b b. In hypothyroidism the bone loses too much calcium which results in osteoporosis (porous bones). Calcium lost from the bones may be deposited in other body structures such as knees, shoulders, breasts , skin or kidneys. Most calcium deposits are small and need no treatment. However, calcium deposits in the kidneys is dangerous as kidney stones is a serious malady that merits urgent medical attention.