I know the little wrigglers make babies but how?
Well, it's quite a feat - a 300,000,000 to 1 shot.
Sperm are tadpole-shaped and about 0.05mm long. From puberty onwards, at least 1,000 sperm a minute are manufactured in the testicles. They take about two and half months to mature and spend the last couple of weeks in the epididymis.
Sperm swim at six inches a second but at the point of ejaculation they are propelled a lot faster - about 28mph along with the rest of the seminal fluid. Two minutes after entering the female, they're at the cervix and five minutes later at the fallopian tubes. During the most fertile part of the female menstrual cycle (when the egg is released - usually between the 12th and 18th day), this journey is much easier because at this time there is plenty of fertile mucus around for the sperm to live off. They can survive like this for a week.
The average ejaculation contains 200-300 million sperm but it only takes one to fertilise the egg. (Just as well as only about 40 of them will get anywhere near the end of the race.)
As well as fertilising the egg, the sperm contains the chromosomes which will determine the baby's sex.
Is it true that sperm counts are falling?
It appears to be. Research suggest that in the last fifty years or so, the number of sperm in the average western male's semen has halved.
Today, about one in seven Britons will seek advice on pregnancy difficulties at some time in their lives. The male will be the cause of the problem in around half of these cases. (About 70% of male infertility problems are caused by a low sperm count.)
All the following can reduce sperm count:
- anabolic steroids (very severely)
- anti-arthritis drugs
- frequent marijuana use
- low levels of minerals such as zinc
- low levels of vitamins, particularly vitamin C
- smoking (reduces the sperm's life expectancy and sense of direction)
- some other prescription drugs (this includes, according to research from Queen's University, Belfast published in April 2004, so-called potency drugs like viagra which is a good argument against 'recreational' use of these drugs by men who might want to start families.)
- a vasectomy which may not be as reversible as is sometimes believed.
I don't want any more kids at my age. Is a vasectomy safe?
Most of the time, yes. We have a page that answers all your vasectomy related questions - The Snip FAQs
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Date of last review 02/04/14
Date of next review 02/04/17
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