Question

Which is NOT the function of placenta?

• A. Supply of oxygen and nutrients to the embryo
• B. Removal of excretory waste products produced by embryo
• C. Production of hCG and HPL
• D. Supply all types of antibodies to the embryo

Hint:

Placenta supplies selective maternal antibodies (mainly IgG), not all. IgM and IgA cannot cross the placenta.

Answer 1

The Correct Option is D

Step 1: Understand the role of the placenta.
The placenta is a vital organ that connects the developing embryo/fetus to the mother. It facilitates:

• Exchange of gases (oxygen and carbon dioxide)
• Nutrient supply
• Removal of metabolic wastes
• Hormone secretion (like hCG – human chorionic gonadotropin, and HPL – human placental lactogen)

Step 2: Role in immunity.
The placenta does allow the transfer of some maternal antibodies, especially IgG, to provide passive immunity to the fetus. However, it does not supply all types of antibodies. For example, IgM and IgA are not transferred across the placenta.

Step 3: Evaluate the options.
Option (1): Correct function – placenta supplies oxygen and nutrients.
Option (2): Correct function – placenta removes embryo’s waste products.
Option (3): Correct function – placenta produces hormones like hCG and HPL.
Option (4): Incorrect statement – Not all types of antibodies are supplied. Only selective ones like IgG are transferred.

Step 4: Conclusion.
Hence, the function mentioned in option (4) is not entirely correct and is the right choice for this question.