Fine Art America is the world's most powerful sales and marketing tool for photographers and visual artists.
Simply open an account, upload your images, set your prices for all our available products, and you're instantly in business! FAA provides you with an e-commerce website, fulfills your orders for you, and sends you your profits each month.
Illustration based on a scanning electron micrograph of a human ovum, or egg, surrounded by numerous spermatozoa. In fertilisation, only a single sperm may successfully penetrate the ovum to fuse with the female nucleus. Barriers to be overcome include layers of follicular cells surrounding the ovum (corona radiata) and an underlying glycoprotein membrane, the zona pellucida. The membrane is digested by enzymes released from the acrosome, a cap on the head of the sperm subsequent rapid chemical changes in the zona pellucida prevent competing sperm from entering.
May 8th, 2013
Viewed 19 Times - Last Visitor from New York, NY on 12/03/2013 at 12:52 PM