Immune System Development in Infants
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Questions and Answers

Why do IgA, IgD, IgE, and IgM not cross the placenta?

  • They require an antigenic challenge for production (correct)
  • Fetal cells neutralize them before they can cross
  • They are actively prevented from crossing
  • They are too large to pass through

    • At what age do phagocytic cells (neutrophils and monocytes) reach adult levels in terms of chemotaxis?

  • 7 years (correct)
  • 13 years
  • 11 years
  • 9 years

    • Which immune response does not cross the placenta?

  • Cellular immunity (correct)
  • Antibody-mediated immunity
  • Inflammatory response
  • Phagocytic response

    • Why might fetal T cells become sensitized to antigens that cross the placenta?

    <p>Cross-reactivity of antigens with maternal antibodies (A)</p> Signup and view all the answers

    Why do infant B cells not respond to infection similar to adult B cells?

    <p>Immaturity of their immune system (B)</p> Signup and view all the answers

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