Diagram of a sperm cells

Ciliated epithelial cell. Before the tube reaches the ovule , the nucleus of the generative cell in the pollen grain divides and gives rise to two sperm nuclei, which are then discharged through the tube into the ovule for fertilization. Internal structure of the axoneme. The penis, which usually hangs limp, becomes hard when a male is sexually excited. Jan 06, 20 AM. Further information: Sperm donation. Egg and Sperm Previous.

A spermatozoon in plural spermatozoa is a motile sperm cell, that is, the reproductive cell of human males, carried in semen, that fertilizes the ovum to create a new human being, while the term sperm is commonly used to refer to the semen. Further information: Spermatozoon. Fawcett, D. It is push mecanism.