BI-1820

Hormones

Biology · Secondary 4 · Hard · Hormones

A pregnant woman smokes regularly. Nicotine molecules have a diameter of about

2.0 \times 10^{-2}\,\mu\text{m}

. The placenta allows particles up to

0.5\,\mu\text{m}

in diameter to pass into the fetus’s blood. What can be concluded about nicotine?

Nicotine can pass through the placenta and enter the fetus’s blood.
Nicotine is too large to pass through the placenta into the fetus’s blood.
Nicotine can pass only if its diameter is increased above $0.5\,\mu\text{m}$ .
Nicotine cannot pass because all toxins are blocked by the placenta.

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