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Fertilization and the Zygote
Fertilization usually happens in one of the fallopian tubes. When sperm are deposited in the vagina, they swim through the cervix into the uterus and then up into the tubes. Of the millions of sperm that begin this journey, thousands reach the tubes. Half of these reach a tube in which a mature egg is found. Out of the few thousand sperm that reach a mature egg, only the first one to break throught the eggs covering fertilizes it.The nucleus of the sperm of the sperm cell and of the egg cell each contains chromosomes.
When the two cells unite, their nuclei combine. The result is a new cell called a zygote.The zygote receives an X chromosome from the egg and an X or Y chromosome from the sperm. XY-zygotes develop into males and XX-zygotes develop into females.The zygote begins to divide as it travels to the uterus. The zygote divides first into cells. These cells divide to form 4 cells.
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The 4 cells divide to become 8 cells, and so on. Each new cell contains 46 chromosomes. About 5 to 7 days after conception, the zygote has become a tiny ball or cluster of cells. This ball attaches itself in the lining of the uterus. The time from this event until the birth of the baby about months later is called pregnancy. The mothers ovaries produce hormones that prevent menstruation and the release of eggs until the baby is born.
The Developing Embryo
During the first eight weeks of pregnancy the new organism is called an embryo. The embryo forms from a layer of cells inside the ball of cells embedded in the uterus. Other cells from the ball of cells become membranes that sorround the embryo. One membrane forms a kind of bag that fills with fluid. The embryo floats inside, cushioned from injury. Still other cells from the original ball of cells grow together with cells from the original ball of cells grow together with cells from the mothers uterus to form an organ called the placenta.
The placenta allows substances to pass between the mother and the embryo. On one side, the placenta is in contact with the mothers blood vessels. On the other side, the placenta connects to the embryos blood vessels by the umbilical cord. Blood vessels from the mother and the embryo are close, but never mix. Food, oxygen, antibodies, and hormones pass from the mothers blood to the embryos blood. Wastes, like carbon dioxide, spread from the embryos blood into the mothers. The placenta enables the mothers body to take care of digestion, circulation, respiration, and excretion for the developing embryo. The placenta also protects the embryo from most diseases although some pathogens, drugs, and chemicals can cross the placenta from the mother. Birth defects might result, especially during the first eight weeks.
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