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Related Concept Videos

Bone Disorders01:29

Bone Disorders

Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...
Changes in the Appendicular Skeleton with Age01:09

Changes in the Appendicular Skeleton with Age

The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
Essential Minerals for Bone Health01:31

Essential Minerals for Bone Health

The minerals contained in all of the food we consume are essential for our organ systems. However, certain essential minerals, such as calcium, phosphorus, magnesium, manganese, and fluoride, largely affect bone health.
Calcium and Phosphorus
Calcium is a critical component of bones, especially in the form of calcium phosphate and calcium carbonate. Since the body cannot make calcium, it must be obtained from the diet. However, calcium cannot be absorbed from the small intestine without...
Role of Vitamins in Maintaining Bone Health01:25

Role of Vitamins in Maintaining Bone Health

The growth and maintenance of bone are regulated by a combination of nutritional factors, including vitamins, such as vitamin A, B12, C, D, and K.
Vitamin A
Vitamin A is involved in the process of bone remodeling. Retinoic acid, the active metabolite of Vitamin A, has nuclear receptors in osteoblasts and osteoclasts, which are involved in bone remodeling.
Vitamin B12
Vitamin B12 acts as a cofactor during the formation of osteoblast-related proteins, such as osteocalcin. Vitamin B12 plays a role...
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...
Bone Remodeling01:40

Bone Remodeling

Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.

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Related Experiment Video

Updated: Jun 7, 2026

Scanning Skeletal Remains for Bone Mineral Density in Forensic Contexts
07:56

Scanning Skeletal Remains for Bone Mineral Density in Forensic Contexts

Published on: January 29, 2018

[Secular trend of bone mineral content decrease in human bone tissue: analysis of the data from Ural region].

E I Tolstykh, N B Shagina, L M Peremyslova

    Morfologiia (Saint Petersburg, Russia)
    |October 22, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Bone mineral density in Ural residents decreased significantly from 1958-1988, especially in younger generations. This secular trend shows an average annual bone mineral content loss of 1%.

    Related Experiment Videos

    Last Updated: Jun 7, 2026

    Scanning Skeletal Remains for Bone Mineral Density in Forensic Contexts
    07:56

    Scanning Skeletal Remains for Bone Mineral Density in Forensic Contexts

    Published on: January 29, 2018

    Area of Science:

    • Osteology
    • Anthropology
    • Public Health

    Context:

    • Analysis of bone mineral content in rib samples from 4685 Ural region residents.
    • Data collection spanned from 1958 to 1988, with donor ages from newborn to 99 years.
    • Donor birth years ranged from 1872 to 1984.

    Purpose:

    • To investigate the influence of gender, age, and birth year on bone mineral content.
    • To identify secular trends in bone mineral density over time.
    • To compare age-dependent bone mineral loss estimates from longitudinal and cross-sectional studies.

    Summary:

    • A significant decrease in bone mineral density was observed between 1958 and 1988, indicating a secular trend.
    • Individuals born after 1920 exhibited a continuous decline in bone mineral content, averaging 3 g/kg per year (approximately 1% annually).
    • Pre-1920 birth cohorts showed an insignificant trend, suggesting generational differences in bone health trajectories.

    Impact:

    • Highlights generational disparities in bone mineral density and age-related bone loss.
    • Provides crucial data for understanding long-term skeletal health trends in populations.
    • Informs public health strategies for osteoporosis prevention and management across different demographics.