MONICA SCHROEDER / SCIENCE PHOTO LIBRARY MONICA SCHROEDER / SCIENCE PHOTO LIBRARY
The thyroid gland displayed in isolation from the body. The thyroid works in conjunction with the parathyroids (in red) which are embedded on the posterior aspect of the gland. The four small parathyroid glands produce calcitonin which lowers blood calcium levels by inhibiting the rate of decalcification.
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