Multiple choice

Which among the following is the main function of the placenta?

  1. The placenta nourishes the developing embryo by implementing a dialysis pattern for exchange between the maternal and fetal circulations.

  2. The placental barrier is highly permeable to glucose and amino acids.

  3. The PO2 of the blood of the umbilical vein in the developing embryo is the same as that in the maternal arterial blood.

  4. The estrogens secreted by the placenta during pregnancy decelerates.

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A Correct answer
Explanation

Placenta is the first organ to develop when blastocyst embeds itself. Nutrients diffuse into the umbilical cord at the placenta that then pass through the ammnionic sac into the fetus. Thus, the placenta nourishes the developing embryo by the dialysis pattern.

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