13 ч 51 мин, 12 июл 2008 г. - Hormone levels
Описание:
During the fifth week of pregnancy the levels of HCG hormone produced by the blastocyst quickly increase. The embryo is made of three layers. The top layer is the ectoderm this will give the baby the outermost layer. In the middle layer the circulatory system will form.(Mayo Clinic)
Добавлено на ленту времени:
Gema
Growth and development timeline
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