Four tiny glands located behind the thyroid that regulate calcium levels in the blood by secreting parathyroid hormone (PTH), essential for bone health and muscle function.
From Greek para meaning 'beside' and thyroid, literally meaning 'beside the thyroid,' reflecting their anatomical position as small glands attached to the back of the thyroid gland.
These four glands are so tiny they're each about the size of a grain of rice, yet they're absolutely critical for life - without them, your calcium levels would drop so low that you'd experience muscle spasms, seizures, and potentially fatal heart rhythm problems. They're like your body's calcium thermostats, constantly monitoring and adjusting!
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