The Pregnant Family-- Unit II-A Conception and Biophysical ...
Fertilization or conception occurs in the oviduct. Twenty-four hours later, cleavage begins. Three to four days after fertilization, the embryo reaches the uterus as a ball of 16 cells. By 5 days after fertilization, the blastocyst forms as a sphere of cells containing a cavity. After a few more days, the blastocyst implants in the endometrium. ................
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