A healthy mother breastfeeds her newborn. Which antibody in breast milk helps protect the infant's mucosal surfaces?
Correct answer: A. Secretory immunoglobulin A
- A. Secretory immunoglobulin A
- B. Immunoglobulin M in red cells
- C. Immunoglobulin E in platelets
- D. Immunoglobulin G in neutrophils
Explanation
Secretory immunoglobulin A in breast milk provides natural passive protection, especially across the infant's gastrointestinal and respiratory mucosa. The infant receives the antibody rather than producing it after vaccination.
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About Blood and Immunity
Blood and immunity covers plasma, red blood cells, white blood cells, platelets, haemoglobin, blood groups and haemostasis. It explains innate and adaptive defenses, antibodies, lymphocytes, inflammation, vaccination and immune memory, with a distinction between active and passive immunity and between antigen and antibody.
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