Hidden behind the thyroid are usually four tiny parathyroid glands—and their job is very different from the thyroid's. The parathyroid glands produce parathyroid hormone, which helps regulate calcium levels in the blood. Calcium is essential for normal nerve signaling, muscle contraction, and many other physiological processes. In this cinematic 3D medical animation, travel behind the thyroid and discover these tiny glands and the role they play in calcium regulation.
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