Which of the following cannot pass through th | vedclass

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(D) The placenta acts as a selective barrier, but many substances can cross it.$1$. The bacteria of syphilis $(Treponema 	ext{ } pallidum)$ can cross

Vedclass · Accepted Answer

None of the above

Vedclass · Answer

(D) The placenta acts as a selective barrier, but many substances can cross it.$1$. The bacteria of syphilis $(Treponema 	ext{ } pallidum)$ can cross the placenta and cause congenital syphilis.$2$. Thalidomide is a drug known to cross the placenta, causing severe birth defects.$3$. The virus of German measles (Rubella virus) is well-documented to cross the placenta and cause congenital rubella syndrome.Since all the listed agents are capable of crossing the placental barrier, the correct answer is that none of the above are excluded from passing through.

Column-$I$ (Time of gestation)	Column-$II$ (Changes in embryo)
$P$. After one month	$I$. Major organ systems are formed
$Q$. End of second month	$II$. Formation of heart
$R$. End of three months	$III$. Development of limbs and digits
$S$. During fifth month	$IV$. Movement of fetus and hair on head

Which of the following cannot pass through the placenta into the foetus?

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