Which is the only antibody that can cross the pla¬centa to protect a fetus before its own immune system becomes active?
A) IgA
B) IgE
C) IgM
D) I gG
E) IgD

Question

Which is the only antibody that can cross the pla¬centa to protect a fetus before its own immune system becomes active?  
A) IgA
B) IgE
C) IgM
D) I gG
E) IgD

Quizplus · Accepted Answer

Immunoglobulin G (IgG) is the only antibody that can cross the placenta and provide passive immunity to a fetus before its own immune system becomes active. IgA, IgE, and IgD do not cross the placenta, and IgM can only do so in limited amounts.

Which Is the Only Antibody That Can Cross the Pla¬centa