ANATOMY
LYMPHATIC SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following antibodies is found in sweat, tears, saliva, and breast milk (levels decreased during stress)?
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IgM
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IgA
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IgD
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IgG
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IgE
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Explanation:
Detailed explanation-1: -Immunoglobulin A (IgA): It’s found in the linings of the respiratory tract and digestive system, as well as in saliva (spit), tears, and breast milk.
Detailed explanation-2: -These maternal milk antibodies include IgA, IgG and IgM isotypes as well as the secretory forms of IgA and IgM. Although all three major classes of immunoglobulins are present in human colostrum and milk, only IgA and IgM are locally produced in the human mammary gland.
Detailed explanation-3: -Maternal milk IgM also takes part in the protection of newborns against pathogens via opsonization of Gram-negative bacteria (33) and is important, in addition to milk SIgA, for immune exclusion of antigens (4).
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