100
an unfertilized egg
A few Days after Fertilization. (apex)
Meiosis 1*2*3*4*5*6*7 = 5040
The zygote is formed when two sex cells join to become haploid. It is at this stage that the zygote begins to split and make more cells. It keeps doing this for 5 days until it is called a blastocyst, which is a ball of cells. After this point, the blastocyst is called an embryo or fetus. The embro continues to make cells which eventually become specialised, like skin cells and muscle cells. It doesn't have anything to do with conservation of mass, just splitting and making thousands of new cells until the zygote becomes a baby.
Embryonic stem cells refer to pluripotent cells that are generally derived from the inner cell mass of blastocysts (day 5). Stem cells have been derived from gonadal ridges and mesenteries (3200 to 4000) extracted from aborted five-to-nine week old human embryos.
About 100 cells make up a blastocyst.
A 5 day blastocyst will be 0.1 to 0.2 milleters (.003 to .005 inch) typically
Implantation of the 5-day old embryonic stage of cells, called the blastocyst occurs. The blastocyst eventually gives rise to gastrula, and further development of the fetus proceeds.
an unfertilized egg
A few Days after Fertilization. (apex)
After conception, the fertilized egg begins to divide rapidly, forming a cluster of cells called a blastocyst. This blastocyst travels down the fallopian tube towards the uterus for about 5-7 days before implantation occurs. Implantation is when the blastocyst attaches to the lining of the uterus, where it will continue to grow and develop into an embryo.
Implantation of an embryo typically occurs around 6-10 days after fertilization. Embryos should be at the blastocyst stage when they implant, which is around day 5-6 after fertilization.
The zygote begins to divide into a blastocyst around 4-5 days after fertilization. This process involves multiple cell divisions and leads to the formation of the blastocyst, which is essential for implantation into the uterine lining.
Meiosis 1*2*3*4*5*6*7 = 5040
It takes about 5-7 days for the blastocyst to travel through the fallopian tube and reach the uterus after fertilization. Once in the uterus, it will implant into the uterine lining.
At the time of implantation, a human embryo is called a blastocyst. This stage occurs about 5-7 days after fertilization and marks the implantation of the embryo into the uterus lining.
Hmmm................... About what 5 to 6 trillion cells