FRANCIS LEROY & ALEXANDRE TESSIER, BIOCOSMOS / SCIENCE PHOTO LIBRARY FRANCIS LEROY & ALEXANDRE TESSIER, BIOCOSMOS / SCIENCE PHOTO LIBRARY
Egg and sperm cells. Animation showing sperm cells (spermatozoa) attempting to fertilise an ovum (egg). The ovum is the female sex cell, while the spermatozoa are the male sex cells. They carry genetic material that if successfully merged in fertilisation results in the formation of a zygote that if implanted in the uterus can develop into a foetus during pregnancy. Men release millions of sperm in each ejaculation, though only one of these can successfully fertilise the ovum.
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