Practice question

MCQ

Question

Which of the following best describes the blood-placental barrier?

Options

Choose one · Correct answer highlighted

It allows direct mixing of maternal and fetal blood It is formed by the trophoblast layers, preventing direct blood mixing while allowing nutrient exchange Correct It is impermeable to all substances It functions only during the first trimester

Explanation

The blood-placental barrier, primarily formed by trophoblast layers, prevents direct mixing of maternal and fetal blood while permitting the exchange of nutrients, gases, and wastes.

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