The document discusses the parathyroid glands, which are located posterior to the thyroid gland. The parathyroid glands contain chief cells and oxyphil cells and secrete parathyroid hormone (PTH), which regulates calcium, magnesium, and phosphate levels. PTH increases calcium levels in the blood by absorbing calcium from bones and releasing calcium, magnesium, and phosphorus through urine. The kidneys also help regulate calcium levels by releasing calcitriol, which aids in calcium absorption from food.

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4. TWO CELLS CHIEF CELLS OXYPHIL CELL

7. PARATHYRIOD HARMONE calcium magnesium phosphate

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