BSIP, ESTIOT / SCIENCE PHOTO LIBRARY BSIP, ESTIOT / SCIENCE PHOTO LIBRARY
Sperm. Computer artwork of human sperm or spermatozoa. These are the sex cells (gametes) produced by human males in the testes. Their function is to deliver genetic material, contained in their oval heads, to the female gamete (ovum). The tails aid the movement of the sperm within the female reproductive system, and the head will release enzymes to penetrate the protein coat of the ovum. The female will normally produce a single ovum and only one sperm, of around 300 million released in ejaculation, will eventually fertilise it. Sperm production commences at puberty and is dependent upon the male sex hormone testosterone.
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