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16 Cards in this Set
- Front
- Back
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Ovulation
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an egg/ovum is released from the ovary
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Fertilization
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a sperm penetrates the outer cover of an ovum/egg, creating a zygote and beginning a period of rapid cellular division
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Gamete
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a reproductive cell, having half the normal number of chromosomes (a sperm or ovum/egg)
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Zygote
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a fertilized egg cell, containing the genetic material of two gametes (a sperm and an egg)
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Implantation
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the embryo implants into the endometrium of the uterus. This step begins pregnancy in the mother, because it triggers her body to begin gestational changes
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Human chorionic gonadotropin
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the growth hormone that is secreted following implantation and causes pregnancy tests to turn positive
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Blastocyst
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the stage of the embryo at implantation, as the cells begin to differentiate
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Tropoblast
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the outer layer of the blastocyst that will become the placenta
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Endoderm
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the inner embryonic layer that will develop into organs, lungs and the GI tract
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Mesoderm
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the middle embryonic layer that will develop into muscles, bones, the circulatory and genitor-urinary systems
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Ectoderm
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the outer layer of the embryo that will develop into the neural tube and skin/sensory organs
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Dizygotic twins
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twins from two separate fertilized eggs (zygotes) that will develop into fraternal twins
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Monozygotic twins
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twins from one fertilized egg that will develop into identical twins
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Embryo
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development from conception to 9 completed weeks gestation (the first trimester)
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Fetus
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development from 10 weeks gestation to delivery
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Teratogen
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any substance or pathogen that may cause harm or hidrance to the developing embryo or fetus
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