Are You Pregnant? Prenatal Development Fertilization: Union of a sperm cell w/ an ovum....
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Transcript of Are You Pregnant? Prenatal Development Fertilization: Union of a sperm cell w/ an ovum....
![Page 1: Are You Pregnant? Prenatal Development Fertilization: Union of a sperm cell w/ an ovum. ~Fertilization takes place in the upper 1/3 of the fallopian.](https://reader036.fdocuments.us/reader036/viewer/2022062421/56649e185503460f94b0489a/html5/thumbnails/1.jpg)
Are You Pregnant?
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Prenatal Development Fertilization: Union of a sperm cell w/ an ovum.~Fertilization takes place in the upper 1/3 of the fallopian tube. Zygote: Fertilized union, egg and sperm unite.
~Once zygote is formed, a protective membrane around it prevents more sperm from entering ovum.
~Zygote begins its journey to uterus and begins cell division.
~Once cell division has begun, zygote is now a blastocyst.
DEVELOPMENT STAGES:Ova> Zygote> Blastocyst> Embryo> Fetus>Baby
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Blastocyst: a cluster of cells that has a hollow space in the center. ~7-8 days later the blastocyst has traveled to the uterus and implanted into the wall of uterus.
~This is called implantation.
~ After implantation, the blastocyst becomes an embryo.
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Embryonic Development Embryo: Cluster of developing cells following implantation.
Amniotic Sac: Bag of water, fluid filled sac around the embryo.~Function- Is a shock absorber that protects the embryo.
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Placenta: Blood rich tissue developed from outer layer of cells from the embryo and tissue of mother.
~Function- Transfer oxygen and nutrients from mother’s blood to embryo also serves as lungs, liver, kidneys, and digestive system for fetus.
Umbilical cord: A tube through which nutrients and oxygen pass from the mother’s blood to embryo’s blood. This tube connects the embryo to the placenta.
Grows to 20 inches
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After 56 days of development all major organs are formed and is now called a fetus.
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Fetus is not called a baby until it is born and breathing on its own.
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Blood of Mom & Fetus never mixAll other nutrients and chemicals are shared!
Miscarriage: Spontaneous abortion, in which a female expels the embryo or fetus. Stillbirth: The birth of a dead baby.
~Fetal Alcohol Syndrome(FAS): 3 main features- mental retardation, slow growth before and after birth, and a wide range of physical defects ranging from cleft palate to hip dislocation
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Twins!Identical Twins – The zygote splits into 2 identical eggs
These eggs now share a placenta Are always the same sex
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Fraternal TwinsThese twins result from 2 separate eggs that fertilize at the same time, but with separate placentas. They can be same or different sex.
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