Sperm

The male reproductive cell, the sperm head, contains the DNA, which, when combined with a female egg, results in a human embryo. The sperm midsection contains mitochondria to power movement with the help of the sperm tail or flagellum.

Ovum

It is the female reproductive cell formed in the ovaries and released during ovulation. During fertilization, the acrosome reaction gives the spermatozoa the necessary changes to cross the ovum zona pellucida or shell and fertilize the ovum.