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Calcium homeostasis.

S D Boden1, F S Kaplan

  • 1Department of Orthopaedic Surgery, George Washington University Medical Center, Washington, DC.

The Orthopedic Clinics of North America
|January 1, 1990
PubMed
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Maintaining calcium and phosphate balance is vital. Three key hormones—parathyroid hormone, calcitonin, and vitamin D—regulate these minerals, with disruptions leading to bone disorders.

Area of Science:

  • Endocrinology
  • Mineral Metabolism
  • Physiology

Background:

  • Calcium and phosphate homeostasis is critical for life.
  • Three primary hormones regulate extracellular calcium and phosphate levels.
  • Disruptions in this system can lead to metabolic bone disorders.

Purpose of the Study:

  • To explain the roles of parathyroid hormone, calcitonin, and vitamin D in calcium homeostasis.
  • To highlight the intricate regulatory network governing mineral balance.
  • To emphasize the importance of understanding normal mechanisms for diagnosing and treating bone disorders.

Main Methods:

  • Review of existing literature on calcium and phosphate regulation.
  • Analysis of the physiological actions of parathyroid hormone, calcitonin, and vitamin D.

Related Experiment Videos

  • Discussion of the interplay between these hormones and their impact on bone and kidney function.

    • Main Results:

    • Parathyroid hormone (PTH) increases serum calcium by acting on bone, kidney, and intestine.
    • Calcitonin, produced by the thyroid, inhibits bone resorption, though its physiological role is debated.
    • Active vitamin D (1,25(OH)2-D) enhances intestinal absorption of calcium and phosphate and influences bone and kidney handling of these minerals.

    Conclusions:

    • These three hormones function in concert to maintain calcium homeostasis.
    • Imbalances in this hormonal system trigger compensatory changes that can result in disease.
    • A thorough understanding of normal calcium regulation is essential for addressing metabolic bone disorders.