Sperm and fertilization

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Human fertilization is the union of a human egg and sperm , occurring in the ampulla of the fallopian tube. Scientists discovered the dynamics of human fertilization in the nineteenth century. The process of fertilization involves a sperm fusing with an ovum. The most common sequence begins with ejaculation during copulation , follows with ovulation , and finishes with fertilization. Various exceptions to this sequence are possible, including artificial insemination , in vitro fertilization , external ejaculation without copulation, or copulation shortly after ovulation. The sperm plasma then fuses with the egg's plasma membrane, triggering the sperm head to disconnect from its flagellum as the egg travels down the Fallopian tube to reach the uterus.
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How Fertilization Happens

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What Is Fertilization and How Does It Occur? What to Know

While you release only a single egg each month, your partner releases millions of sperm in a single ejaculation — all with an 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 cool tricks to give themselves a fighting chance. Read on to find out how fertilization actually works. However, fertilization actually occurs in the fallopian tubes.
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Fertilization

Fertilization , union of a sperm nucleus , of paternal origin, with an egg nucleus, of maternal origin, to form the primary nucleus of an embryo. In all organisms the essence of fertilization is, in fact, the fusion of the hereditary material of two different sex cells , or gametes , each of which carries half the number of chromosomes typical of the species. The most primitive form of fertilization, found in microorganisms and protozoans, consists of an exchange of genetic material between two cells.
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Suarez, A. At coitus, human sperm are deposited into the anterior vagina, where, to avoid vaginal acid and immune responses, they quickly contact cervical mucus and enter the cervix. Cervical mucus filters out sperm with poor morphology and motility and as such only a minority of ejaculated sperm actually enter the cervix. In the uterus, muscular contractions may enhance passage of sperm through the uterine cavity.
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