Q:

Where does testosterone come from?

A:

Quick Answer

While a small percentage of testosterone is made in the adrenal glands, about 95 percent of testosterone is produced in male testicles. The hypothalamus detects a testosterone deficiency and sends a gonadotropin-releasing hormone to the pituitary gland, which then sends two hormones to the testicles that stimulate testosterone production.

Know More

Full Answer

Testosterone is a 19-carbon steroid hormone made from cholesterol. Pure or free testosterone, unbound to proteins, makes up about 2 to 3 percent of total testosterone levels. In this form, it is able to enter cells and activate receptors.

Testosterone bound to sex-hormone-binding-globulin, a protein produced in the liver, is biologically inactive. It does not provide any of the benefits of pure testosterone, but makes up about 40 to 50 percent of the total testosterone levels. The remainder of testosterone is bound to albumin, another protein produced in the liver. Although albumin-bound testosterone is also inactive, the bond between protein and testosterone is weak, and can be broken to create free testosterone.

A male begins producing testosterone about seven weeks after conception. It aids in forming male genitals in the womb, and surges in the body during puberty. Testosterone drives the growth of body hair, plays a role in behaviors such as aggression or dominance, and can spark competitiveness. Low testosterone can result in a loss of confidence or lack of motivation.

Learn more about Glands & Hormones

Related Questions

  • Q:

    What is the function of the adrenal gland?

    A:

    The adrenal glands are responsible for creating hormones, including cortisol, aldosterone, androgen, noradrenaline and adrenaline. Each person has two adrenal glands, and one is located on the top of each kidney.

    Full Answer >
    Filed Under:
  • Q:

    What is Addison's disease?

    A:

    Addison's disease occurs when the adrenal glands don't produce sufficient quantities of cortisol and aldosterone. The adrenal glands are part of the endocrine system, which regulates metabolism, mood, growth and how a person responds to stress.

    Full Answer >
    Filed Under:
  • Q:

    How can you naturally increase testosterone?

    A:

    Male testosterone levels can be increased in safe, healthy ways, explains WebMD, primarily through lifestyle changes involving diet and exercise. Some changes that improve testosterone levels include getting adequate sleep, keeping a healthy weight, getting cardiovascular exercise regularly, performing strength training, managing stress and avoiding or monitoring use of medications that can lower testosterone. These include opioid pain relievers, such as Oxycontin; anabolic steroids; and glucocorticoid medicines, such as prednisone.

    Full Answer >
    Filed Under:
  • Q:

    What does testosterone do in the body?

    A:

    Testosterone is a sex hormone that is responsible for aiding in the development of the male sexual characteristics. Females also have minute concentrations of the hormone, but it is mostly found in males and is considered to be the principal male hormone.

    Full Answer >
    Filed Under:

Explore