Which of the following substances can pass th | vedclass

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(B) The placenta acts as a selective barrier between the maternal and foetal blood circulation. Small molecules like oxygen,carbon dioxide,nutrients,a

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Viruses of smallpox

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(B) The placenta acts as a selective barrier between the maternal and foetal blood circulation. Small molecules like oxygen,carbon dioxide,nutrients,antibodies $(IgG)$,and certain viruses can cross the placental barrier. Viruses,such as the smallpox virus,have a low molecular weight compared to large plasma proteins,$WBCs$,and $RBCs$,allowing them to pass through the placental membrane into the foetus. Therefore,the correct option is $(b)$.

Which of the following substances can pass through the placenta from the mother into the foetus?

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