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Except endocrine function, what are the ...

Except endocrine function, what are the other functions of placenta.

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(i) Helps in nutrition of embryo as supplies the nutrients. (ii) Helps in respiration as of maternal blood and `CO_2` of the foetal blood capillaries are exchanged through placenta. (iii) Provides passive immunity as the antibodies against diphtheria, small pox, measles, etc. pass from maternal to foetal blood. (iv) Acts as effective barrier for some toxic chemicals like serotonin and pathogens.
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