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Located within or near thyroid
Most mammals have 2 pairs (Pig has only 1 pair of external and lacks internal parathyroid) (💡"Pig" has 1 "P" = 1 pair of parathyroids)
External parathyroid
Internal parathyroid
Produces parathyroid hormone (PTH)
Parathyroid Hormone (PTH)
Parathyroid Hormone (PTH)
Produced by Chief cells of parathyroid
Major regulator of blood calcium and phosphate levels
Increases blood calcium concentration
Decreases blood phosphate concentration
Promotes the formation of calcitriol and absorption of calcium
Regulated by levels of ionized calcium in plasma
Detected by the chief cells
Test Yourself:
Test Yourself:
Q: What animal only has 1 pair of parathyroids?
Q: What animal only has 1 pair of parathyroids?
A: Pig; has only 1 pair of external and lacks internal parathyroid
Q: How does Parathyroid Hormone (PTH) affect blood calcium and phosphate concentrations?
Q: How does Parathyroid Hormone (PTH) affect blood calcium and phosphate concentrations?
A: Increases blood calcium concentration; Decreases blood phosphate concentration
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