Today we bring babies and more a question that may seem you basic to these heights, but already you can see that it is very interesting. We are going to know better What is the pregnancy.
It is called pregnancy, pregnancy, pregnancy or pregnancy the period that elapses from the implantation of the egg fertilized in the womb until the time of delivery.
From the egg is fertilized produce changes in the body of the woman, both physiological and metabolic, intended to protect, nurture, and provide everything needed for proper development of the fetus.
They put in place during pregnancy complex hormonal processes It will affect almost all of the organs of the woman’s body causing what is known as symptoms of pregnancy.
The first symptom is amenorrhea or absence of menstruation, but other signs of pregnancy such as hypersensitivity may occur also in the breasts, dizziness, nausea, vomiting, malaise and fatigue.
Pregnancy in human pregnancy tends to be unique, however they may occur multiple pregnancies. Depending on the number of fertilized eggs and the moment in which the division of the Zygote occurs, there are different types of twins: univitelinos, bivitelinos twins, twin pregnancy triple, quadruple, quintuple, etc..
The duration of pregnancy
The approximate duration of a pregnancy is 280 days. They are 40 weeks from the first day of the last menstrual period or 38 weeks (approximately nine months) from the time of fertilization.
It is considered a pregnancy to term that elapses between 37 weeks (259 completed days) week 42 of pregnancy (294 days old).
A pregnancy of less than 37 weeks is considered pre-term, While one of more than 42 weeks is considered post-termino.
There is a formula for the due date, known as Nägele rule, which is to subtract three months and adding seven days to date (first day) of last menstrual period.
Pregnancy is divided into quarters. Q1 covers until week 14 of pregnancy (12 weeks), the third quarter and the second quarter of week 14 week 28 of pregnancy from week 28 a week until birth.
The embryonic period extends from implantation of the Zygote in the walls of the uterus until the 10th week of gestation, when the major structures have been completed and passed to be considered fetus.
Changes of women in pregnancy
Weight gain in pregnancy is of 12 kilos of media. It is mainly caused by the weight of the baby, the placenta and the amniotic fluid, as well as also by increasing the size of the uterus, breast and extracellular fluid.
In addition to the physical changes more obvious such as weight gain and growth of gut, there are other less visible responsible largely discomfort most common in pregnancy such as edema, back pain, changes in the skin and constipation.
Produced modifications at the hormonal level, but also at respiratory, hormonal, digestive, circulatory, kidney, bone and nervous.
The blood volume pregnant women increases between 50 and 80 per cent for the needs of the baby’s growth, leading to dilation of the blood vessels, the appearance of varicose veins, palpitations and tachycardia.
As the uterus increases in size, internal organs move slightly from its position. At the same time, changes occur postural skeleton that adapts to the embarazoy prepares for childbirth.
Pregnancy in other species
The gestation period of other mammals It varies depending on the size of the species and stage of development. From the hamster, whose gestation period is the shortest, between 16 and 18 days, until the elephant, which lasts almost two years.
Here are some examples:
- Rat gestation is 22 days (3 weeks + 1 day)
- The gestation of the sheep is 150 days (21 weeks + 6 days)
- The gestation of the cow is 283 days (40 weeks + 3 days)
- Horses gestation is 336 days (48 weeks)
- The gestation of the whales is between 360 and 390 days (55 weeks approx.)
- The gestation of the elephants is between 600 and 660 days (90 weeks approx.)
Pregnancy is a momentous period in the life of the woman, both from physiological and psychological point of view. His body is transformed to give life to a new be is gesta and feeds inside the mother’s uterus until it is ready to be born.
Is an incredibly perfect process that you can know better through these images of pregnancy week by week.
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