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Dr. Ronald Roth Acu-Cell AI

Parathyroid Hormone and Serum Calcium Regulation

  • Primary Role: Parathyroid hormone (PTH) is secreted by the parathyroid glands in response to low serum ionized calcium levels.
  • Bone Resorption: PTH stimulates osteoclast activity, releasing calcium and phosphorus from bone stores into the bloodstream.
  • Kidney Reabsorption: In the kidneys, PTH increases the reabsorption of calcium from the urine, while concurrently increasing the excretion of phosphorus.
  • Vitamin D Activation: PTH promotes the conversion of inactive vitamin D into its active form (calcitriol or 1,25-dihydroxyvitamin D) in the kidneys.
  • Intestinal Absorption: Active vitamin D then enhances the absorption of dietary calcium from the gastrointestinal tract.
  • Negative Feedback Loop: As serum calcium levels rise back to normal, the parathyroid glands detect this change and reduce PTH secretion, maintaining mineral homeostasis.
AI-generated in the approach of Dr. Ronald Roth. Not his own words.
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Connections

Parathyroid hormones - connections

Parathyroid hormones ->

-> Parathyroid hormones

Serum calcium - connections

Serum calcium ->

  • Does Not Indicate: Calcium status (Scope: nutritional excess or deficiency)

-> Serum calcium

Calcium - connections

Calcium ->

-> Calcium

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