Which immunoglobulin is primarily involved in natural passive immunity transferred from mother to fetus?

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Prepare for your Microbial Growth Phases, Oxygen Needs, and Immunity Types Test. Use our multiple-choice questions and detailed explanations for each answer to enhance your understanding and ensure success!

Multiple Choice

Which immunoglobulin is primarily involved in natural passive immunity transferred from mother to fetus?

Explanation:
The concept being tested is how maternal antibodies protect the fetus before birth. IgG is the antibody class that most readily crosses the placenta via the placental Fc receptors (FcRn), delivering systemic, long-lasting immunity to the fetus and newborn. This is why natural passive immunity transferred from mother to fetus is primarily carried by IgG. IgM is too large to cross the placenta, so it doesn’t provide fetal passive immunity. IgA is mainly secreted in breast milk and helps protect the infant after birth at mucosal surfaces rather than across the placenta. IgE is not significantly transferred and is mainly involved in allergic responses and defense against parasites.

The concept being tested is how maternal antibodies protect the fetus before birth. IgG is the antibody class that most readily crosses the placenta via the placental Fc receptors (FcRn), delivering systemic, long-lasting immunity to the fetus and newborn. This is why natural passive immunity transferred from mother to fetus is primarily carried by IgG.

IgM is too large to cross the placenta, so it doesn’t provide fetal passive immunity. IgA is mainly secreted in breast milk and helps protect the infant after birth at mucosal surfaces rather than across the placenta. IgE is not significantly transferred and is mainly involved in allergic responses and defense against parasites.

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