What does this number measure?
A cell whose long flagellum enables movement. The sperm cell's head carries genetic material; the midpiece and flagellum contribute to its mobility. The length shown includes the entire cell.
Compare the stated dimensions
The comparison uses the number in each fact sheet: altitude, height, diameter, length or distance, depending on the reference. Two values in metres do not necessarily describe the same property.
Source and limitations
Catalogue order of magnitude; a source is provided, but this measurement has not been individually audited.
Human sperm cell: head, midpiece and long, almost extended flagellum. Morphological model with interpreted proportions; representative length of the whole cell.