Researchers at the University of Ghana have looked into the efficacy and safety of Mucuna pruriens seed powder on male fertility. In their paper, "Moderate doses of Mucuna pruriens seed powder is safe and improves sperm count ...
A team of researchers from the U.S., China and Taiwan has found some rare instances of fathers passing mitochondrial DNA (mtDNA) to their offspring. In their paper published in Proceedings of the National Academy of Sciences, ...
More than 45 million couples worldwide grapple with infertility, but current standard methods for diagnosing male infertility can be expensive, labor-intensive and require testing in a clinical setting. Cultural and social ...
Mar 22, 2017
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University of California, Berkeley, biologists have discovered the switch that triggers the power kick sperm use to penetrate and fertilize a human egg, uncovering a possible source of male infertility but also a potential ...
Mar 17, 2016
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A genetic study of over 24,000 parents and their children has shown that the children of teenage fathers have unexpectedly high levels of DNA mutations.
Feb 18, 2015
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(Medical Xpress)—Jiahao Sha and his colleagues at Nanjing University in China studied humans and mice with genetic abnormalities that prevent them from producing a protein called seipin. Lack of seipin causes body fat to ...
Scientists at the Universities of Birmingham and Warwick have shed new light on how sperm navigate the female reproductive tract, 'crawling' along the channel walls and swimming around corners; with frequent collisions.
May 7, 2012
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Many couples struggle with infertility. Contrary to popular belief, men are just as often the cause of an unfulfilled desire for children as women—and genetics play a significant role in this. Researchers from the Institute ...
Aug 23, 2024
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According to a World Health Organization (WHO) study (2017), about half of all infertility is due to men. Semen analysis is considered essential for diagnosis of male infertility, but is not readily available at medical institutions ...
Jul 31, 2024
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An unexpectedly versatile and regenerative stem cell in early embryos may be key to creating new effective fertility treatments, suggests a new study in mice from the University of Copenhagen.
Jun 24, 2024
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The term sperm is derived from the Greek word (σπέρμα) sperma (meaning "seed") and refers to the male reproductive cells. In the types of sexual reproduction known as anisogamy and oogamy, there is a marked difference in the size of the gametes with the smaller one being termed the "male" or sperm cell. The human sperm cell is haploid, so that its 23 chromosomes can join the 23 chromosomes of the female egg to form a diploid cell. A uniflagellar sperm cell that is motile is referred to as a spermatozoon, whereas a non-motile sperm cell is referred to as a spermatium. Sperm cells cannot divide and have a limited life span, but after fusion with egg cells during fertilization, a totipotent zygote is formed with the potential to develop into a new organism.
The spermatozoa of animals are produced through spermatogenesis inside the male gonads (testicles) via meiotic division. They are carried out of the male body in a fluid known as semen. Mammalian sperm cells can live for up to 3 days inside the female reproductive system.[citation needed]
Sperm cells in algal and many plant gametophytes are produced in male gametangia (antheridia) via mitotic division. In flowering plants, sperm nuclei are produced inside pollen.
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