Fertilization. Computer artwork of a human sperm (spermatozoon) successfully penetrating an egg (ovum). Only one sperm can penetrate the egg's thick outer layer (zona pellucida) and fertilize it. Fertilization occurs when DNA (deoxy- ribonucleic acid) released by the sperm fuses with DNA contained in the egg. Women produce a single egg at a time,whilst men release around 500 million sperm. The sperm use their flexible tails to travel through the female reproductive tract. Only a few thousand sperm reach the egg,which is located in one of the Fallopian tubes | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Animated Healthcare |
Taille de l’image : | 3150 px × 4455 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |