As fertilization occurs
Pregnancy Week By Week / / March 23, 2016
Ten lunar months
Have you ever wondered what miracle is the emergence of a new life?What undergoes metamorphosis cell, turning into a human?As the unborn baby changes your life and what is happiness - to look into his unusually wise eyes and studying the soul!
Everyone knows that pregnancy lasts 9 months.However, in medicine it is accepted to count periods of gestation and birth of a baby for weeks.All the way from the birth of a new life before the child's birth is 40 weeks or 10 lunar months, the duration of which is equal to the classic menstrual cycle - 28 days.
And that is why pregnancy calendar does not include the usual 9 and 10 lunar months.So a woman is more convenient to keep track of the changes occurring in her body, follow the advice of experts and count how much time is left before the climax - the birth of the baby.
Pregnancy conventionally divided into three stages.The first - the construction of the body and organs of the fetus, its supporting livelihoods.The second - the tab andconfigure all systems of the body a little man.The third - the preparations for the birth.
fertilization process before the male cell to meet with the women, held from 3 to 6 hours.Going forward, many sperm do not stop for a second.On their way they encounter many obstacles, invented by nature, with the result that eliminated the weak and unsustainable.As a result, to the cherished goal gets some of the strongest and hardiest sperm.For the fertilization process the egg will be chosen one, all the others are doomed.
Once men broke through the cell cover female egg, spreads throughout the body knows that fertilization has occurred.It starts lightning restructuring, necessary to maintain pregnancy.Change the chemical reaction in a different innervation of the uterus is divided, reduced immunity, to avoid rejection, and the body has not taken a fertilized egg of a dangerous tumor.
During fertilization of two parent cells with half the number of chromosomes is formed one - a zygote.This full education, with its own unique genetic code that determines the sex of a child, his character, eye color and shape of the ears.Zygote is located in the fallopian tube.Only on the seventh day she opus¬kaetsya into the uterus, where he began to "look after" a place to attach.
Going on a long journey, thrifty prihvatyvaet egg with a meal (yellow body), so in the first week is not so important that part of the diet of expectant mother.But after embryonic egg to attach to the uterine wall, it is very important as a woman eats and what is life.Now the development of the embryo depends entirely on the mother's mental and physical condition.
Embrionchik like a leech clings to the wall of the uterus and "digs" into it.At this stage, called the implantation and lasts for approximately 40 hours, the cells divide and exterior embedded in the endometrium, which grow rapidly.Inside branching blood vessels are formed, over time, they are transformed into the placenta, and will supply the new body before the birth.From the embryonic node forms the body of the future man, and from the surface of cells - is germ-part (amniotic bubble, umbilical cord, placenta), are necessary to ensure the safe existence of the baby.
Pregnancy conventionally divided into three stages.The first - the construction of the body and organs of the fetus, its supporting livelihoods.The second - the tab and configure all systems of the body a little man.The third - the preparations for the birth.Amniotic bubble (amnion) is a sac filled with amniotic fluid - a colorless liquid, sweetish taste.Water protects the delicate creation of the uneven pressure of the uterus walls, temperature extremes, shock and noise, as well as facilitate the exchange of substances.
placenta, or afterbirth, - a unique, fantastic body, the true source of life.The placenta carries fresh oxygen-rich blood from the mother to the baby's umbilical cord vein and at the same time takes away from the arteries and waste products decomposition products and removes them.It also performs a child lung, kidneys and the digestive system, furthermore, acts as a filter, creating a barrier to bacteria and harmful substances.
addition hormones produced in the placenta and biologically active elements, which play an important role in the development of the fetus.The umbilical cord or umbilical cord connects the baby's body with the placenta.She vessels blood flow from mother to child and back again.So, the future man made a cozy nest and began to grow rapidly.
Pregnancy - this is an adventure, where there are wonders and dangers."Do not exaggerate," - you might say.So, there is no exaggeration in this comparison no.
process of egg fertilization
|Sperm attack the egg.Fantastic spectacle!Sperm tails beat synchronously, causing the egg to rotate slowly counterclockwise.Inside will get only one of them.|
|Zygote: the DNA of the sperm already inside the egg.Soon it will merge paternal and maternal half of the genetic program and begin the first cell division.So fertilization occurs.|
|first days after conception.In the egg has two daughters.|
|second day after conception.The division is continuing.|
|second - the beginning of the third day after conception.Eight blastomeres.If the artificial insemination (the child "test-tube") in the woman's uterus podsazhivayut just such an embryo.|
|This blastocyst.Similar to the mulberry?|