The more scientists learn about mammalian reproduction the more amazing the process appears to be. In our January/February 2009 issue we discussed the fact that the immunological system of the mother tends to reject the fetus and that an elaborate system is designed to allow the baby to develop within the mother’s womb. New data has now come to show that the mechanism that allows the sperm to find the egg is far more complex than anyone dreamed.

Dr. Michael Eisenbach of the Weizmann Institute of Science has released a study showing that the sperm is directed to the egg by temperature variations in the fallopian tubes — a process called thermotaxis. The egg rests at a spot that has a higher temperature than where the sperm begin their journey. There has previously been data to show that the unfertilized egg releases attractants to get the sperm to head in the direction of the egg — a process called chemotaxis.

It has always been a mystery to researchers as to why the sperm seem to head straight for the egg. They are simply cells, not organisms with a brain. It now appears that the reproductive system is designed in such a way that several things motivate these cells to move toward union with the egg. It seems that conception is a miracle of design, and obviously one that has been incredibly successful. Source: Science News, February 1, 2003, page 69.

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