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  2. Semen - Wikipedia

    en.wikipedia.org/wiki/Semen

    A 1992 World Health Organization report described normal human semen as having a volume of 2 mL or greater, pH of 7.2 to 8.0, sperm concentration of 20×10 6 spermatozoa/mL or more, sperm count of 40×10 6 spermatozoa per ejaculate or more, and motility of 50% or more with forward progression (categories a and b) of 25% or more with rapid ...

  3. Semen quality - Wikipedia

    en.wikipedia.org/wiki/Semen_quality

    A semen analysis typically measures the number of sperm per millilitre of ejaculate, and analyzes the morphology (shape) and motility (ability to swim forward) of the sperm (the typical ejaculate of a healthy, physically mature young adult male of reproductive age with no fertility-related problems usually contains 300–500 million spermatozoa ...

  4. Semen analysis - Wikipedia

    en.wikipedia.org/wiki/Semen_analysis

    Sperm count, or sperm concentration to avoid confusion with total sperm count, measures the concentration of sperm in ejaculate, distinguished from total sperm count, which is the sperm count multiplied with volume. Over 16 million sperm per milliliter is considered normal, according to the WHO in 2021. [8] Older definitions state 20 million.

  5. Human reproduction - Wikipedia

    en.wikipedia.org/wiki/Human_reproduction

    Only 1 in 14 million of the ejaculated sperm will reach the fallopian tube. The egg simultaneously moves through the fallopian tube away from the ovary. One of the sperm encounters, penetrates and fertilizes the ovum, creating a zygote. Upon fertilization and implantation, gestation of the fetus then occurs within the uterus. [11] [12] [13] [14]

  6. Spermatogenesis - Wikipedia

    en.wikipedia.org/wiki/Spermatogenesis

    [29] [30] Testosterone production does not remain constant throughout the day, but follows a circadian rhythm. The maximum peak of testosterone occurs at 8 a.m., which explains why men frequently suffer from morning erections.

  7. Spermatozoon - Wikipedia

    en.wikipedia.org/wiki/Spermatozoon

    A human sperm cell consists of a flat, disc shaped head approximately 5.1 by 3.1 μm (0.20 by 0.12 mils), and a tail, known as a flagellum 50 μm (2.0 mils) long. [4] The flagellum propels the sperm cell at about 1 to 3 millimetres per minute (0.66 to 1.97 mils per second) [5].

  8. Male infertility - Wikipedia

    en.wikipedia.org/wiki/Male_infertility

    A study was done in 1992 with men who had never experienced infertility showed that the amount of sperm in semen had declined by 1% per year since 1938. [ 79 ] [ 80 ] Further research a few years later also confirmed the decline in sperm count and also seminal volume. [ 81 ]

  9. 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]