Question

If the placenta asks as a barrier, a filter, why do you think that some toxins and infectious agents are able to pass by, and affect fetal development?

Answer 1

Answer:
`\textbf{Here is a brief description of my findings;}`

- Lead, cobalt, arsenic and selenium appear to pass the placental barrier by a diffusion mechanism. It was also found that the mercury levels in cord blood were almost double those of the mother, suggesting that the foetus may act as a filter for the maternal mercury levels during pregnancy.

Explanation:

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