Stages in dating sex web ca s

Posted by / 30-Dec-2016 22:54

Stages in dating

If a sperm penetrates the egg, fertilization results.Tiny hairlike cilia lining the fallopian tube propel the fertilized egg (zygote) through the tube toward the uterus.The amniotic sac fills with a clear liquid (amniotic fluid) and expands to envelop the developing embryo, which floats within it.

The fertilized egg (zygote) divides repeatedly as it moves down the fallopian tube to the uterus. Then it becomes a hollow ball of cells called a blastocyst.

The heart and major blood vessels begin to develop earlier—by about day 16.

The heart begins to pump fluid through blood vessels by day 20, and the first red blood cells appear the next day.

Blood vessels continue to develop in the embryo and placenta.

Almost all organs are completely formed by about 10 weeks after fertilization (which equals 12 weeks of pregnancy).

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Blood vessels from the embryo, which pass through the umbilical cord to the placenta, develop in the villi.

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