Alysha Saunders

Conception is a fighting battle between the female body and sperm. After ejaculation there are nearly three hundred million sperm floating through the vagina, but only one will make it to fertilization. Fertilization occurs when an egg and a sperm recognize each other and fuse together to form an embryo. Odds are stacked against you when you are hoping to conceive. There are plenty of barriers blocking the sperm from entering the cervix, but luckily there are tricks the sperm and the egg have come up with to increase their chances of fertilization.
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During ejaculation the liquid portion of the semen, not only provides sperm with nourishment of the journey; it actually coagulates the women's vagina, forming a physical barrier that prevents the sperm from wandering very far in the wrong direction.
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The cervical canal is a much better place for the sperm. The sperm is now submerged in cervical mucus and are carrier through the cervix.
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Once the sperm have gotten through these steps and travelled through the fallopian tubes they arrive at the destination of the egg. But before fertilization they must get through the hard, outer layer of the egg. The first sperm to get through is now called the embryo and will be transformed into a fetas.
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https://www.youtube.com/watch?v=4qegAMEZ_Ok <VIDEO THE GREAT SPERM RACE

References:

http://www.parents.com/videos/device/mobile/v/63983316/sperm-meets-egg-weeks-1-to-3-of-pregnancy.htm

http://www.m.webmd.com/baby/guide/understanding-conception

http://www.embryolog.ch/anglais/dbefruchtung/weg02.html

http://space.dawsoncollege.qc.ca/explorations/article/fertilization_miss_understood

http://www.teenhelp.org/forums/f6-sex-puberty/t140848-difference-between-hymen-cervix/

http://parentsavvy.com/pregnancy/?Subtopicld=26941&Docld=psc,607555