Friday, December 26, 2008
source of photo: http://aycu31.webshots.com/image/44110/2002564320883082356_rs.jpg
Since I talked about the egg cell yesterday, I thought I might as well talk about the sperm cell today.
If you look at the picture, you will notice the big difference between the size of the sperm and the egg. What is shown in the picture is only a small segment of the egg cell. A sperm cell is only about 25 micrometers or less in diameter while the egg cell is about 200 micrometers or even more in some animals.
A sperm cell contains only the nucleus which occupies the "head" part of the sperm, plus several mitochondria in the "neck" part. The rest of the sperm consists of the flagellum.
According to http://hypertextbook.com/facts/2000/EugeneKogan.shtml, the average speed of a sperm is "1–4 millimeters per minute".