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Related Concept Videos

Skeleton and Calcium Homeostasis01:21

Skeleton and Calcium Homeostasis

Calcium is not only the most abundant mineral in bone but also the most abundant mineral in the human body. Calcium ions are needed for bone mineralization, tooth health, heart rate regulation and strength of contraction, blood coagulation, the contraction of smooth and skeletal muscle cells, and the regulation of nerve impulse conduction. The average calcium level in the blood is about 10 mg/dL. When the body cannot maintain this level, a person will experience hypo or hypercalcemia.
Hormones and Bone Tissue01:17

Hormones and Bone Tissue

The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
Hormones That Influence Osteoblasts and/or Maintain the Matrix
Several hormones are necessary for controlling bone growth and maintaining the bone matrix. The pituitary gland secretes growth hormone (GH), which, as its name implies, controls bone growth. This happens in several ways: first, it triggers chondrocyte...
The Parathyroid Glands00:59

The Parathyroid Glands

The two pairs of parathyroid glands embedded within the posterior surface of the thyroid gland are restricted by a dense capsule around them. These glands comprise two distinct cell populations—parathyroid oxyphil and parathyroid principal cells- pivotal in calcium homeostasis.
Oxyphil cells, whose functions remain elusive, emerge during late puberty, adding a layer of complexity to the parathyroid gland's intricacies. In contrast, principal parathyroid cells undertake a vital role by producing...
Hypothyroidism II: Pathophysiology01:23

Hypothyroidism II: Pathophysiology

Hypothyroidism is a disorder characterized by insufficient production of thyroid hormones, which regulate metabolism, energy balance, and multiple organ systems.TypesHypothyroidism is classified based on the level of dysfunction. Primary hypothyroidism results from intrinsic thyroid gland dysfunction, causing reduced hormone production despite normal or increased stimulation. Secondary hypothyroidism arises from inadequate thyroid-stimulating hormone (TSH) secretion by the pituitary. Tertiary...
Hyperthyroidism II: Pathophysiology01:27

Hyperthyroidism II: Pathophysiology

Hyperthyroidism is a hypermetabolic state caused by elevated levels of thyroid hormones, triiodothyronine (T3) and thyroxine (T4). It results from dysregulation at the thyroid, pituitary, or immune system level and affects multiple organ systems.PathophysiologyThe most common cause of hyperthyroidism is Graves’ disease, an autoimmune disorder in which antibodies, specifically thyroid-stimulating antibodies (TSAb), a subtype of TSH receptor antibodies (TRAb), bind to and activate TSH receptors...
Synthesis and Functions of Calcitonin00:51

Synthesis and Functions of Calcitonin

Calcitonin, a vital polypeptide hormone, regulates calcium levels within body fluids. It is released by the parafollicular cells, also known as C cells, situated in the follicular epithelium of the thyroid gland. Calcitonin responds to fluctuations in blood calcium levels and the influence of gastrointestinal hormones like gastrin and cholecystokinin.
The exact mechanisms by which calcitonin operates in calcium homeostasis remain elusive, but its significance is evident in several vital...

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Related Experiment Video

Updated: Jun 22, 2026

Two Techniques to Create Hypoparathyroid Mice: Parathyroidectomy Using GFP Glands and Diphtheria-Toxin-Mediated Parathyroid Ablation
07:13

Two Techniques to Create Hypoparathyroid Mice: Parathyroidectomy Using GFP Glands and Diphtheria-Toxin-Mediated Parathyroid Ablation

Published on: March 14, 2017

Calcium malabsorption does not cause secondary hyperparathyroidism.

B E Christopher Nordin1, Howard A Morris, Michael Horowitz

  • 1Clinical Biochemistry, SA Pathology, Frome Road, Adelaide, SA 5000, Australia. christopher.nordin@imvs.sa.gov.au

Calcified Tissue International
|June 3, 2009
PubMed
Summary
This summary is machine-generated.

Calcium malabsorption does not cause secondary hyperparathyroidism. Instead, it prevents the normal drop in parathyroid hormone (PTH), increasing osteoporosis risk.

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Last Updated: Jun 22, 2026

Two Techniques to Create Hypoparathyroid Mice: Parathyroidectomy Using GFP Glands and Diphtheria-Toxin-Mediated Parathyroid Ablation
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Published on: March 14, 2017

Generation of Hypoparathyroid Rats via Carbon-Nanoparticle-Assisted Parathyroidectomy
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Generation of Hypoparathyroid Rats via Carbon-Nanoparticle-Assisted Parathyroidectomy

Published on: July 14, 2023

Area of Science:

  • Endocrinology
  • Bone Metabolism
  • Nutritional Science

Background:

  • Secondary hyperparathyroidism is often attributed to calcium malabsorption.
  • Osteoporosis is a significant public health concern, particularly in aging populations.

Purpose of the Study:

  • To challenge the assumption that calcium malabsorption directly causes secondary hyperparathyroidism.
  • To investigate the relationship between calcium absorption, parathyroid hormone (PTH) levels, and osteoporosis.
  • To clarify the role of vitamin D and renal function in age-related PTH increases.

Main Methods:

  • Review of existing literature and clinical observations.
  • Analysis of serum parathyroid hormone (PTH) levels in relation to calcium absorption, menopause, and osteoporosis.
  • Examination of factors influencing diurnal PTH variations and reference intervals.

Main Results:

  • Serum PTH does not rise at menopause despite decreased calcium absorption.
  • Osteoporotic women with vertebral fractures do not exhibit elevated PTH despite low calcium absorption.
  • Age-related PTH increase is linked to declining serum 25(OH)D and/or renal function.
  • Fasting PTH levels are not influenced by prior calcium intake but can be lowered by evening calcium supplements.

Conclusions:

  • Calcium malabsorption is a risk factor for osteoporosis by disrupting normal PTH diurnal patterns, not by causing secondary hyperparathyroidism.
  • The calcemic action of vitamin D and renal function are key factors in regulating PTH and bone metabolism.
  • Understanding these mechanisms is crucial for effective osteoporosis prevention and management.