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Related Concept Videos

Bone Cells and Tissue01:30

Bone Cells and Tissue

Bones contain a relatively small number of cells entrenched in a matrix of organic and inorganic components. Although bone cells compose only a small amount of the bone volume, they are crucial to its function. Four types of cells are found within the bone tissue— osteoblasts, osteocytes, osteogenic cells, and osteoclasts.
Osteoblasts and Osteocytes
The osteoblast is the bone cell responsible for forming new bone tissue. It is found in the growing portions of bone, including the periosteum and...
Compact Bone01:27

Compact Bone

Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
Compact bone, also called cortical bone, is the denser, stronger of the two types of bone tissue. It is found under the periosteum and in the diaphyses of long bones, where it provides support and protection. The microscopic structural unit of compact bone is called an osteon, or haversian system. Each osteon is composed of concentric rings of calcified...
Blood and Nerve Supply to the Bones01:29

Blood and Nerve Supply to the Bones

Bones are dynamic organs that require a rich supply of oxygen and nutrients. Around 5% to 10% of the cardiac output supplies blood to the bones. A typical long bone has three main sources: the nutrient artery, the metaphyseal and epiphyseal arteries, and the periosteal arteries.
Nutrient Artery
The nutrient artery is the main blood vessel that enters the diaphysis via the nutrient foramen. While most long bones have only one nutrient foramen, large bones, such as the femur, may have two. This...
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...

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Related Experiment Video

Updated: Jul 22, 2026

Experimental Approach to Examine Leptin Signaling in the Carotid Bodies and its Effects on Control of Breathing
05:45

Experimental Approach to Examine Leptin Signaling in the Carotid Bodies and its Effects on Control of Breathing

Published on: October 25, 2019

Leptin: brains and bones.

J F Whitfield

    Expert Opinion on Investigational Drugs
    |January 5, 2002
    PubMed
    Summary

    Leptin, a protein from fat cells, regulates body fat and energy reserves. New research reveals leptin also controls bone growth through two distinct mechanisms, impacting bone formation and resorption.

    Area of Science:

    • Endocrinology
    • Bone Biology
    • Metabolic Regulation

    Background:

    • Leptin, a key adipokine, primarily regulates energy homeostasis and body fat.
    • Emerging evidence suggests leptin influences skeletal health beyond its metabolic roles.

    Discussion:

    • Leptin's dual action on bone: it inhibits osteoblast function via a hypothalamic factor and directly promotes bone anabolism.
    • Leptin stimulates osteoblasts to produce Insulin-like Growth Factor-I (IGF-I), a critical mediator of bone growth.
    • Leptin also inhibits osteoclast generation, thus reducing bone resorption.

    Key Insights:

    • Leptin is identified as a novel regulator of bone growth.
    • Leptin exerts complex, opposing effects on bone remodeling.
    • The hypothalamic regulation of bone by leptin is a newly discovered pathway.

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    Related Experiment Videos

    Last Updated: Jul 22, 2026

    Experimental Approach to Examine Leptin Signaling in the Carotid Bodies and its Effects on Control of Breathing
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    Experimental Approach to Examine Leptin Signaling in the Carotid Bodies and its Effects on Control of Breathing

    Published on: October 25, 2019

    Isolation of Targeted Hypothalamic Neurons for Studies of Hormonal, Metabolic, and Electrical Regulation
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    White and Brown Adipose Grafts: An Approach to Correct Reproductive, Metabolic, and Renal Deficits in Black and Tan Brachyury (BTBR) Obese Mice
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    Outlook:

    • Further elucidation of the hypothalamic osteoblast-inhibiting factor(s) is warranted.
    • Investigating leptin's role in bone diseases like osteoporosis is a promising future direction.
    • Therapeutic strategies targeting the leptin-bone axis could offer new treatments for skeletal disorders.