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  2. Testosterone - Wikipedia

    en.wikipedia.org/wiki/Testosterone

    Testosterone is the primary male sex hormone and androgen in males. [3] In humans, testosterone plays a key role in the development of male reproductive tissues such as testicles and prostate, as well as promoting secondary sexual characteristics such as increased muscle and bone mass, and the growth of body hair.

  3. Exercise and androgen levels - Wikipedia

    en.wikipedia.org/wiki/Exercise_and_androgen_levels

    Acutely, other studies have shown testosterone to increase. [33] In a small group of anaerobically trained athletes, stressful training acutely even decreased serum testosterone and its ratio to cortisol and SHBG, with an increase in LH. With subsequent decompensation, testosterone was stable, but cortisol and SHBG decreased. [21]

  4. Effects of hormones on sexual motivation - Wikipedia

    en.wikipedia.org/wiki/Effects_of_hormones_on...

    Research from male rhesus monkeys suggests testosterone functions to increase sexual motivation, thereby motivating males to compete for access to sexual partners. It is postulated that the motivating effects of testosterone in male rhesus monkeys promotes successful sexual competition and may be particularly important motivating tools for low ...

  5. Male reproductive system - Wikipedia

    en.wikipedia.org/wiki/Male_reproductive_system

    The main male sex organs are the penis and the scrotum, which contains the testicles that produce semen and sperm, which, as part of sexual intercourse, fertilize an ovum in the female's body; the fertilized ovum develops into a fetus, which is later born as an infant. The corresponding system in females is the female reproductive system.

  6. Testosterone (medication) - Wikipedia

    en.wikipedia.org/wiki/Testosterone_(medication)

    Testosterone is a medication and naturally occurring steroid hormone. [9] It is used to treat male hypogonadism, gender dysphoria, and certain types of breast cancer. [9] [10] It may also be used to increase athletic ability in the form of doping. [9] It is unclear if the use of testosterone for low levels due to aging is beneficial or harmful ...

  7. Human penis - Wikipedia

    en.wikipedia.org/wiki/Human_penis

    This means that in the event of a rival male's sperm occupying the reproductive tract of a female, the human penis is able to displace the rival sperm, replacing it with his own. [42] Semen displacement has two main benefits for a male. Firstly, by displacing a rival male's sperm, the risk of the rival sperm fertilising the egg is reduced. [43]

  8. Sex differences in human physiology - Wikipedia

    en.wikipedia.org/wiki/Sex_differences_in_human...

    The human male reproductive system. The human female reproductive system. The male and female perineum. Males and females have different sex organs. Females have two ovaries that store the eggs, and a uterus which is connected to a vagina. The external genitals are called the vulva. Males have testicles that produce sperm.

  9. Development of the reproductive system - Wikipedia

    en.wikipedia.org/wiki/Development_of_the...

    Diagrams to show the development of male and female generative organs from a common type. A.—Diagram of the primitive urogenital organs in the embryo previous to sexual distinction. 3. Ureter. 4. Urinary bladder. 5. Urachus. cl. Cloaca. cp. Elevation which becomes clitoris or penis. i. Lower part of the intestine. ls.

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