New York State Chemistry RegentsNew York State Earth Science Regents

 
Living Environment Regents June 2003 Question 23 PDF Print E-mail
Reproduction and Development

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Correct Answer: (2) Materials are exchanged between fetal and maternal blood.

Placenta functions for the delivery of oxygen and food from the mother to the fetus. Aside from that, it also aids in disposal of the fetus' waster through the mother's kidney.

Incorrect Answers:

Oxygen diffuses from the maternal blood to the fetal blood.

Maternal blood is not converted into fetal blood. The fetal blood is developed from the fetus itself through the process of differentiation of cells during embryonic development.

Digestive enzymes do not pass on from the maternal blood. Just like blood, the digestive enzymes needed by the fetus are formed in the fetus during development.

 

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