How a sperm fertilizes an egg

Following ejaculation, the semen forms a gel that protects it from the acidic environment of the vagina. The gel is liquefied within 20 to 30 minutes by enzymes from the prostate gland. This liquefaction is important for freeing the sperm so transportation may occur. The seminal plasma is left in the vagina. The protected sperm with the greatest motility travel through the layers of cervical mucus that guard the entrance to the uterus.
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How Fertilization Happens

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Conception: How It Works | Patient Education | UCSF Health

While you release only a single egg each month, your partner releases millions of sperm in a single ejaculation — all with their eye on that single prize. But only one of those sperm will be crowned the victor, and the odds are stacked against fertilization. Luckily, egg and sperm have developed some pretty nifty tricks to give themselves a fighting chance. Fortify the troops. The liquid portion of semen not only provides the sperm with nourishment for the journey, it actually coagulates in a woman's vagina after ejaculation, forming a physical barrier that prevents the sperm from wandering very far in the wrong direction.
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10 Things to Know About Fertilization

There are many misconceptions about fertilization and pregnancy. While fertilization can seem like a complicated process, understanding it can equip you with knowledge about your own reproductive system and empower you to make decisions. Fertilization takes place in the fallopian tubes , which connect the ovaries to the uterus. Fertilization happens when a sperm cell successfully meets an egg cell in the fallopian tube.
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Clue is on a mission to help you understand your body, periods, ovulation, and so much more. Start tracking today. Only a tiny fraction of the sperm that entered the vagina make it to the fallopian tube. It takes about days for the fertilized egg to travel to the uterus and attach to the uterus in a process known as implantation.
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