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An immature ovum enclosed by a single layer of cells
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Primary follicle
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A mature follicle
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Graafian follicle
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An egg; the female reproductive cell
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Ovum (ova, pl.)
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The germ cell of a man
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Sperm
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A process that sperm undergo while traveling through the woman's reproductive tract in which their membranes become thin enough so than an enzyme necessary for softening the ovum's membrane can be released.
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Capacitation
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The union of an egg and a sperm
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Conception
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The one-celled organism created from the fusion of a sperm and egg
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Zygote
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The collection of cells formed when the zygote begins rapid cell division
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Morula
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The fluid-filled sphere that reaches the uterus after fertilization and which was created by the transformation of the morula through continued, rapid cell division.
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Blastocyst
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The process by which the blastocyst attaches itself to the wall o the uterus
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Implantation
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The outer four cell layers of the embryo
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Trophoblast
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The cord that connects an embryo or fetus to the mother's placenta
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Umbilical cord
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A thick-skinned sac filled with water that surrounds the fetus
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Amnion
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The fourth membrane of the trophoblast; it develops into the lining of the placenta
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Chorion
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An organ that serves as a connection or interface between the fetus' systems and those of the mother
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Placenta
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