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Related Concept Videos

Hormonal Regulation01:40

Hormonal Regulation

Hormones regulate a significant portion of digestion through activation of the neuroendocrine system. The neuroendocrine system of digestion contains many different hormones all with multiple functions that are both, directly and indirectly, involved in digestion.
Hormonal Regulation01:33

Hormonal Regulation

The renin-aldosterone system is an endocrine system which guides the renal absorption of water and electrolytes, thus managing blood pressure and osmoregulation. Activation of the system begins in the kidneys with a small cluster of cells adjacent to the afferent and efferent blood vessels of the renal corpuscle. As the nephrons are filtering blood, juxtaglomerular cells monitor blood pressure. If they detect a decrease in pressure, they release the hormone renin into the bloodstream.
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...
Exercise and Muscle Performance01:27

Exercise and Muscle Performance

Exercise induces a range of adaptations in muscle tissue, depending on the type and duration of activity. Such physical training can be broadly categorized into two types: endurance exercises and resistance exercises.
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...
Hormones of the Adrenal Glands01:31

Hormones of the Adrenal Glands

Adrenal hormones play a pivotal role in maintaining the body's electrolyte balance and orchestrating responses to stress, showcasing the intricate functions of the adrenal cortex and medulla.
The adrenal cortex, a powerhouse of hormone synthesis, generates over two dozen corticosteroid hormones. The zona glomerulosa produces mineralocorticoids, exemplified by aldosterone, influencing the electrolyte composition of body fluids. The synthesis of glucocorticoids such as cortisol and corticosterone...
Testosterone: Functions and Regulation01:26

Testosterone: Functions and Regulation

The intricate hormonal interplay essential for male reproductive health begins with the release of gonadotropin-releasing hormone (GnRH) by the hypothalamus. This hormone prompts the pituitary gland to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH). LH targets the Leydig cells in the testes, stimulating them to produce and release testosterone. In concert with testosterone, FSH acts on the Sertoli cells within the seminiferous tubules to facilitate the release of...

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Related Experiment Video

Updated: Jul 23, 2026

Human Neuroendocrine Tumor Cell Lines as a Three-Dimensional Model for the Study of Human Neuroendocrine Tumor Therapy
12:04

Human Neuroendocrine Tumor Cell Lines as a Three-Dimensional Model for the Study of Human Neuroendocrine Tumor Therapy

Published on: August 14, 2012

Steroids. Building a better you?

B Berlin

    New Jersey Medicine : the Journal of the Medical Society of New Jersey
    |March 25, 2004
    PubMed
    Summary

    Anabolic steroid use began in the 1950s for strength gains and has since spread beyond athletes. An estimated one million Americans now use these substances nonmedically, fueling a $400 million illicit market.

    Area of Science:

    • Sports Medicine
    • Endocrinology
    • Public Health

    Background:

    • Anabolic steroid use originated with weightlifters in the 1950s aiming to enhance muscle mass and strength.
    • The nonmedical use of anabolic steroids has expanded significantly beyond professional athletics.
    • Current usage spans high school athletes, gym enthusiasts, and fitness communities.

    Purpose of the Study:

    • To examine the historical context and current prevalence of nonmedical anabolic steroid use.
    • To understand the scope and market size of the illicit anabolic steroid trade.
    • To highlight the widespread accessibility of anabolic steroids in various social settings.

    Main Methods:

    • Historical review of anabolic steroid usage patterns.
    • Analysis of market data to estimate prevalence and economic impact.

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    High-throughput Image Analysis of Tumor Spheroids: A User-friendly Software Application to Measure the Size of Spheroids Automatically and Accurately
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    High-throughput Image Analysis of Tumor Spheroids: A User-friendly Software Application to Measure the Size of Spheroids Automatically and Accurately

    Published on: July 8, 2014

    Protocols for Visualizing Steroidogenic Organs and Their Interactive Organs with Immunostaining in the Fruit Fly Drosophila melanogaster
    12:10

    Protocols for Visualizing Steroidogenic Organs and Their Interactive Organs with Immunostaining in the Fruit Fly Drosophila melanogaster

    Published on: April 14, 2017

    Related Experiment Videos

    Last Updated: Jul 23, 2026

    Human Neuroendocrine Tumor Cell Lines as a Three-Dimensional Model for the Study of Human Neuroendocrine Tumor Therapy
    12:04

    Human Neuroendocrine Tumor Cell Lines as a Three-Dimensional Model for the Study of Human Neuroendocrine Tumor Therapy

    Published on: August 14, 2012

    High-throughput Image Analysis of Tumor Spheroids: A User-friendly Software Application to Measure the Size of Spheroids Automatically and Accurately
    08:39

    High-throughput Image Analysis of Tumor Spheroids: A User-friendly Software Application to Measure the Size of Spheroids Automatically and Accurately

    Published on: July 8, 2014

    Protocols for Visualizing Steroidogenic Organs and Their Interactive Organs with Immunostaining in the Fruit Fly Drosophila melanogaster
    12:10

    Protocols for Visualizing Steroidogenic Organs and Their Interactive Organs with Immunostaining in the Fruit Fly Drosophila melanogaster

    Published on: April 14, 2017

  • Sociological assessment of user demographics and locations.

    • Main Results:

    • Anabolic steroid use was first documented among weightlifters in the 1950s.
    • An estimated one million Americans currently use anabolic steroids for nonmedical reasons.
    • The illicit market for anabolic steroids is valued at approximately $400 million annually.

    Conclusions:

    • Nonmedical anabolic steroid use is a widespread issue extending from athletic communities to general fitness settings.
    • The accessibility and demand for anabolic steroids have created a substantial illicit market.
    • The prevalence underscores a significant public health concern regarding nonmedical performance-enhancing drug use.