This image shows a smear of mature bull spermatozoa.  These specialized,  cells have a head (which contains the genetic material and acrosome),  a midpiece (which contains mitochondria to supply the ATP needed for motility) and a tail (which consists of a flagellum used for locomotion). 

This site was last modified May 10, 2002.    NOTE: These pages are best viewed at a screen size of 800 X 600 pixels.

The address of A/P Lab is:  http://bioweb.uwlax.edu/aplab/      Direct comments or questions to gillis.rick@uwlax.edu