Medical research

Nut consumption causes changes in sperm DNA function, study shows

Many environmental and lifestyle factors have been implicated in the decline of sperm quality, with diet being one of the most plausible factors identified in recent years. Moreover, several studies have reported a close ...

Medical research

Collecting sperm from COVID-19 patients

How does COVID-19 affect sperm and thus the next generationĀ“s immune system? Researchers from the University of Bergen are collecting sperm to find the answer.

Health

High-fat diet in childhood may affect sperm later in life

New research in mice suggests that a high-fat diet early in life may impair male fertility in adulthood. The first-of-its-kind study is published ahead of print in the American Journal of Physiology-Endocrinology and Metabolism.

Health

Donor conception risks exposed in world-first study

Adults conceived through sperm donation reported higher frequencies of allergies, type 1 diabetes and other autoimmune conditions in a world-first study that examined the long term health outcomes of donor-conceived people.

Health

Overweight and obesity are associated with a low sperm quality

Infertility affects between 10 and 15% of all couples of reproductive age and can be caused by a wide variety of factors: genetic, physiological, environmental and nutritional. Although there is increasing scientific evidence ...

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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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