News tagged with sperm
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.
Medical research May 07, 2012 | 4.8 / 5 (5) | 1 |
A new study led by scientists from the Lawrence Berkeley National Laboratory (Berkeley Lab) found that a healthy intake of micronutrients is strongly associated with improved sperm DNA quality in older men. In younger men, ...
Health Aug 27, 2012 | 5 / 5 (3) | 1 |
(Medical Xpress) -- Women look for tall, dark and handsome. Those chiseled features and that deep sexy voice have gained the attention of women for generations. However, a new study published in PLoS ONE shows ...
Other Jan 09, 2012 | 3.1 / 5 (8) | 11 |
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 | 4.5 / 5 (4) | 4 |
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 | 5 / 5 (7) | 0 |
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 | 5 / 5 (2) | 0 |
A study in mice conducted by researchers at Tufts University School of Medicine (TUSM) suggests that a woman's risk of anxiety and dysfunctional social behavior may depend on the experiences of her parents, particularly fathers, ...
Psychology & Psychiatry Aug 22, 2012 | 5 / 5 (1) | 0 |
(Medical Xpress)—Human embryonic stem cells (hESCs) and human induced pluripotent stem cells (hiPSCs) can be coaxed into becoming precursor sperm cells, suggesting that it might be possible one day to restore fertility ...
Medical research Aug 28, 2012 | 5 / 5 (1) | 0 |
The development of a male contraceptive pill has long proven to be elusive, but findings from a new study may point scientists in the right direction to making oral birth control for men a reality.
Medical research Aug 16, 2012 | 4.3 / 5 (6) | 2 |
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.
Medical research Sep 21, 2012 | 5 / 5 (3) | 0 |
An injection of banked sperm-producing stem cells can restore fertility to male primates who become sterile due to cancer drug side effects, according to researchers at the University of Pittsburgh School of Medicine and ...
Medical research Nov 01, 2012 | 5 / 5 (1) | 1 |
(HealthDay)—Diet can have a notable impact on reproductive health, a group of new studies suggests.
Health Oct 26, 2012 | 5 / 5 (1) | 1 |
The entire genomes of 91 human sperm from one man have been sequenced by Stanford University researchers. The results provide a fascinating glimpse into naturally occurring genetic variation in one individual, ...
Genetics Jul 19, 2012 | 5 / 5 (8) | 0 |
Experts from Durham University have identified a new gene that could help the development of fertility treatments in humans in the future.
Medical research May 01, 2012 | 5 / 5 (1) | 0 |
A new type of male contraceptive could be created thanks to the discovery of a key gene essential for sperm development.
Genetics May 24, 2012 | 5 / 5 (5) | 0 |
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.
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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