In the simplest type of placenta,the foetal b | vedclass

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(C) In the simplest type of placenta (epitheliochorial),there are six barriers between the foetal and maternal blood: $(1)$ foetal endothelium,$(2)$ f

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(C) In the simplest type of placenta (epitheliochorial),there are six barriers between the foetal and maternal blood: $(1)$ foetal endothelium,$(2)$ foetal connective tissue,$(3)$ foetal chorionic epithelium,$(4)$ maternal uterine epithelium,$(5)$ maternal connective tissue,and $(6)$ maternal endothelium.In humans,the placenta is of the haemochorial type,where the maternal blood comes into direct contact with the foetal chorionic epithelium.Therefore,the three maternal barriers—$(4)$ uterine epithelium,$(5)$ uterine connective tissue,and $(6)$ endothelium of maternal blood vessels—are lost.

In the simplest type of placenta,the foetal blood is separated from the maternal blood by six barriers. How many barriers are lost in the human placenta?

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