News tagged with sperm

Related topics: eggs · fertilizer · genes · infertility · females

'Kick-starting' male fertility

Adding a missing protein to infertile human sperm can 'kick-start' its ability to fertilise an egg and dramatically increase the chances of a successful pregnancy, a team of Cardiff University scientists have uncovered.

Sep 21, 2012
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Perceptions of conception

For many women, the decision to get pregnant can take on a life of its own. In fact, according to a survey conducted for SpermCheck Fertility, 42% of those who conceived say they became obsessed with getting pregnant once ...

Mar 08, 2012
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Paternal exposures can adversely affect sperm

Acording to the California Teratogen Information Service (CTIS) Pregnancy Health Information Line, more studies are needed to evaluate men and the potential effect of illnesses, medications and lifestyle habits on fertility ...

Jun 20, 2011
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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.

This text uses material from Wikipedia, licensed under CC BY-SA

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