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Every 8 days and ovum is released from one of a womans ovaries. This is just general, eveyone is diffrent
Once released into the vaginal canal, sperm remain viable for up to 6 daysConception actually takes place in the fallopian tube where sperm and ovum unite to form the zygote.
Zygote - What the egg and sperm are called as soon as they unite. (the egg takes the spem into its self and then seals off)
Period of the Zygote
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Lasts aboutweeks, from fertilization untill the cell mass drifts out of the fallopian tubes and attaches itself to the uterine wall. About 50 % never get beyone the first week ago, usually because it does not attact to the uterine wall.
Rapid cell devisioin takes place
By the 4th day, 60 to 70 cells exist that form a holow fluid filled ball called a blastocyst. (think of a waterballoon, thats kind of what it looks/feels like.) These cells are alreay starting to take on chararistics
The embryonic disk (the cells on the inside of the blastocyst) will become the new organism.
The outer cells are called the trophblash will provide protective covering. This keeps the developing babyImplantation occurs between the 7th and th day when the blastocyst burrows deep into the lining of the uterus.
The amnion is a membrane that enclosed the developing organismin amniotic fluid. The amnion is Amniotic fluid is like a warm bath. It also provieds cushion.
The yolk sac produces blood cells untill the liver, speen and bone marrow mature enoughto takeover this function. This dissapears in the second period.
As many as 0% zygotes do not make it through this phase.
If the cell devision does not execute correctly the body will misscarrage.
The chorion a protective membrane develops around the amnion by the end of the second week. Little threads come out of chorion and they attatch themselves to the uterin wall. Out of that comes the placenta and the umbilical cord.The placenta is a special organ that permits food and oxygen to reach the zygote and waste products to be caried away.
The umbilical cord connects the placent to the developing organism.
The period of the Embryo
This periods last about 6 weeks, from implantation to the 8th week of pregnancy.
The cells begin to take on human features. Little arms, legs, hearts and lungs.
The most rapid prenatal changes take place during these 6 weeks as the ground work for all body structures andinternal organs is begun.
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