Endocrine and nervous systems - Index Page
Embedded in the thyroid gland are the four parathyroid glands. The parathyroid glands secrete the parathyroid hormone (PTH). Calcitonin and PTH work antagonistically to maintain homeostasis of calcium ion concentrations in the blood. High levels of calcium ions stimulate the secretion of calcitonin, which causes deposition of calcium in the bones. ................
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