Obstetrics & gynaecology

Fertility treatments could get a boost from stem cells

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.

Health

Boosting male fertility

Conversations around fertility are often centered around women. Infertility is not just an issue occurring among females; males also experience infertility. A Baylor College of Medicine urologist explains the factors affecting ...

Diseases, Conditions, Syndromes

Study suggests hepatitis E may be a sexually transmitted infection

Researchers have discovered that the hepatitis E virus is associated with sperm in pigs, which suggests the virus may be both sexually transmitted and linked to male infertility, according to a new study published in PLOS ...

Medical research

Researchers find no evidence that sperm counts are dropping

The widely held view that sperm counts in men are dropping around the world may be wrong, according to a new study by University of Manchester, Queen's University in Kingston, Canada and Cryos International, Denmark.

Diseases, Conditions, Syndromes

Researchers find microplastics in canine and human testicular tissue

University of New Mexico researchers have detected significant concentrations of microplastics in the testicular tissue of both humans and dogs, adding to growing concern about their possible effect on human reproductive ...

Obstetrics & gynaecology

Male hormonal birth control? It may be closer than you think

Matthew Treviño and Emily Fletcher are self-described DINKWADs—double income, no kids, with a dog. The Sacramento couple, who met and work at UC Davis, are as committed to each other as they are to not having children, ...

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Sperm

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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