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Human sperm cell. Coloured scanning electron micrograph (SEM) of the head of a healthy human sperm cell. This is the male sex cell, and is responsible for fertilising the female egg (ovum). A man releases millions of sperm cells in each ejaculation. The sperm travel to the egg by beating their tails (upper right). The head contains the genetic material that fuses with the female genetic material to form a new human. The tip of the head is called the acrosome. This releases enzymes that help the sperm penetrate the egg. Only one sperm may penetrate the egg the egg membrane forms a barrier to sperm once penetrated. Magnification x11,000 when printed 10cm wide.
May 2nd, 2013
Viewed 2 Times - Last Visitor from Brisbane, 04 - Australia on 11/24/2013 at 5:29 AM