Fill in the Blanks Pregnancy Online version Fill in the gaps in the paragraph with the words above. by Kate Paternoster 1 lining embryo uterus systems seventh umbilical digestive move birth cord embryo lungs sac grow amniotic blood liquid placenta organs endometrium foetus ninth First Trimester : The zygote begins to divide into several cells and an forms . The embryo attaches to the of the uterus ( ) . The forms around the embryo . It is a membrane full of that protects the embryo . The placenta forms . The is an organ that permits the exchange of substances between the mother's and the through the . Second Trimester : The embryo becomes a . It grows and all the begin to form inside . It starts to take on human form and begins to . Third Trimester : The foetus continues to and mature . After the month , the development of the body is complete , although the and are not yet mature . Around the month , the foetus engages with the head towards the opening of the , in preparation for .
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