There are four
parathyroids in the endocrine system which are attached to the
rear side of the thyroid (see below). The primary role of
the parathyroid is to help control the amount of calcuim in the
blood using a hormone called parathyroid hormone (PTH).
PTH controls the amount of calcium removed from the bones, while
uses calcitonin to
control the amount of calcium stored in the bones.
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