News tagged with sperm
Researchers develop sperm-sorting design that may aid couples undergoing in vitro fertilization
(Medical Xpress)—According to the World Health Organization, approximately 70 million couples experience infertility worldwide. Current data suggests that nearly one third of infertility disorders are due ...
Medical research
May 23, 2013 |
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Medical myth: You can control the sex of your baby
Despite most parents ultimately just wishing for a healthy baby, there are many cultural and social factors that can drive the desire for a baby of a particular sex.
Health
Apr 17, 2013 |
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Effect of medication is affected by copies of genetic information
The results may help to explain why certain medications have strong side effects on sperm and eggs, and why certain organisms remain unaffected by environmental changes. This is shown by studies that researchers from the ...
Genetics
Apr 10, 2013 |
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Research show little support for controls on overseas fertility treatment
Problems in accessing donor sperm and eggs at home appear to be behind a reported increase in the number of UK citizens who seek fertility treatment abroad, despite the fact that this is widely seen as risky. ...
Other
Mar 20, 2013 |
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Can environmental contaminants cause lower sperm count?
The amount of perfluorooctanoic acid (PFOA) that mothers had in their blood during pregnancy affected their sons' semen quality at 20 years old. These findings appear in a recent study from Aarhus University ...
Health
Mar 20, 2013 |
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Sorting out fertility after childhood cancer
As success rates in treating childhood cancers have improved, greater emphasis is being placed on quality of life issues following successful treatment. Many cancer treatments can lead to infertility, but there are few methods ...
Cancer
Mar 15, 2013 |
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FSH, inhibin B poor predictors of sperm count after cancer
(HealthDay)—Serum levels of follicle-stimulating hormone (FSH) and inhibin B are not good predictors of sperm levels in male survivors of childhood cancer, according to a study published online Feb. 19 ...
Cancer
Mar 08, 2013 |
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Paternal obesity impacts child's chances of cancer
A father's obesity is one factor that may influence his children's health and potentially raise their risk for diseases like cancer, according to new research from Duke Medicine.
Overweight and Obesity
Feb 05, 2013 |
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TV viewing, exercise habits may significantly affect sperm count
Men's sperm quality may be significantly affected by their levels of physical activity, according to a new study led by researchers at Harvard School of Public Health (HSPH). They found that healthy young men who were sedentary, ...
Health
Feb 04, 2013 |
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Epigenetic reprogramming: Research discovers how epigenetic information could be inherited
New research reveals a potential way for how parents' experiences could be passed to their offspring's genes. The research was published today, 25 January, in the journal Science.
Genetics
Jan 24, 2013 |
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Kan. case reveals risks of assisted reproduction
(AP)—The case of a Kansas sperm donor being sued by the state for child support underscores the confusing patchwork of laws that govern how assisted reproduction is regulated in the United States.
Other
Jan 21, 2013 |
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Semen quality of young men in southeast Spain down by 38% in the last decade
The first comparative study on the evolution of sperm quality in young Spanish men over ten years, headed by researchers at the University of Murcia, reveals that spermatozoid concentration in men between ...
Health
Jan 18, 2013 |
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One cell is all you need: Innovative technique can sequence entire genome from single cell
The notion that police can identify a suspect based on the tiniest drop of blood or trace of tissue has long been a staple of TV dramas, but scientists at Harvard have taken the idea a step further. Using ...
Genetics
Jan 07, 2013 |
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New strategies needed to encourage male cancer survivors to consider future fertility
Pioneering research presented at the Fertility 2013 conference today (Thursday 3 January 2013) shows that a large proportion of male cancer patients are missing out on appropriate fertility advice.
Cancer
Jan 03, 2013 |
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Sperm donor offspring call for privacy changes
Hideaki Kato discovered his true identity by accident. During his medical training a decade ago, the now 39-year-old Japanese doctor was performing blood tests on family members when he learned something ...
Other
Jan 01, 2013 |
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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.
For more information about Sperm, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
