Pregnancy

Pregnancy

The gestation or pregnancy is the process that grows and develops the fetus inside the uterus. It is considered that pregnancy begins once the egg is fertilized by sperm. It ends withthe birth, the baby is born. There is discussion as to whether pregnancy begins at the time of implantation or conception. It's a common mistake, since the months of pregnancy are usually counted fromthe nesting, and the woman begins to have the first symptoms in the same stage. But the actual pregnancy begins just at the time when fertilization occurs. In humans lasts 40 weeks from the end of thelast menstrual period or 38 weeks from the date of fertilization. It is usually associated to 9 months. Inside the womb, the baby is floating in amniotic fluid, and in turn the liquid and the childare involved in the amniotic sac, which adheres to the uterus. In the cervix, forming a plug during pregnancy to prevent the discharge of the liquid. And as a barrier to the entry of foreign bodieswhich greatly facilitates intercourse during pregnancy, following the couple. While remaining within the fetus obtains oxygen and nutrients and removes waste from your metabolism through the placenta. Theplacenta is attached to the uterus and is attached to the baby through the umbilical cord, where it receives nourishment. According to its development, pregnancy is usually divided into three phasesof three months each, in order to simplify the reference to the different stages of fetal development.
During the first trimester the risk of abortion is higher (natural death of embryo or fetus).This is more prevalent in pregnancies achieved through in-vitro fertilization, because the implanted embryo may stop developing because of errors in the chromosomes inherited from the gametes of theparents. During the second trimester fetal development can begin to be monitored and diagnosed. The third quarter marks the beginning of viability, which means that the fetus could survive an early...