, MD, Saint Louis University Class aff dating of Medicine
Once per month, an egg is released from an ovary in to a tube that is fallopian. After sexual activity, sperm move through the vagina through the cervix and womb into the fallopian pipes, where one semen fertilizes the egg. The fertilized egg (zygote) divides over over and over repeatedly because it moves down the fallopian tube to the womb. First, the zygote turns into a ball that is solid of. Then it turns into a hollow ball of cells called a blastocyst.
The blastocyst implants in the wall of the uterus, where it develops into an embryo attached to a placenta and surrounded by fluid-filled membranes inside the uterus.
The placenta and fetus have been developing for 6 weeks at 8 weeks of pregnancy. The placenta types tiny projections that are hairlike) that extend to the wall surface associated with the uterus. Arteries through the embryo, which go through the cord that is umbilical the placenta, develop within the villi.
A slim membrane layer separates the embryo’s bloodstream when you look at the villi through the mom’s blood that flows through the area surrounding the villi (intervillous area). Continuer la lecture
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