New York State Chemistry RegentsNew York State Earth Science Regents

 
Living Environment Regents August 2010 Question 18 PDF Print E-mail
Friday, 27 May 2011 12:50
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Correct answer: (4) toxins in the bloodstream of the mother

Cigarettes contain nicotine, carbon monoxide and tar that can be distributed to the bloodstream through smoking or secondhand smoke. These toxins may prevent the flow of oxygen from the mother to the baby.

Incorrect answers:

(1) decreased digestive activity in the stomach of the fetus

The fetus is not yet capable of digestion. It receives nutrition from the mother through the placenta, which is a combination of maternal and embryonic tissues that transport nutrients, respiratory gases, and wastes to and from the fetus.

(2) a decrease in the amount of oxygen in the ovary of the mother

Though it is true that there would be a decrease in the amount of the oxygen transported to the fetus when a mother smokes, it is not true that respiratory gases like oxygen passes through the ovary. Respiratory gases are transported to the fetus through the placenta.

(3) inhalation of secondhand smoke by the fetus

The fetus is incapable of inhaling air yet. It receives respiratory gases from the blood of the mother through the placenta.
 

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