FIVE CLASSES OF - IgA1015%(inblood) ,saliva,tears,andbreastmilk.Consideringthe bodyasawhole,.(serum

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FIVE CLASSES OF IMMUNOGLOBULINS -IgA---10 - 15% of circulating antibodies (in blood) but found in large numbers in mucous  membranes and body secretions such as mucus, saliva, tears, and breast milk. Considering the  body as a whole, IgAs are the most abundant antibodies. Considering only the blood (serum)  IgGs are the most abundant. When found in serum, this class is most in the form of a monomer  and is called serum IgA. In secretions, two monomers are joined by a J chain and this form is  called secretory IgA. This form is produced by plasma cells in the mucous membrane, and then  passes through a mucosal cell on its way to become part of the secretion. As it passes through the  mucosal cell, it acquires a polypeptide called a secretory component that protects it from  enzymes that may also be found in the secretion. Functions: Prevents attachment of pathogens to the mucous membranes (viruses and certain bacteria)
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This note was uploaded on 01/23/2012 for the course MCB MCB2010 taught by Professor Smith during the Fall '09 term at Broward College.

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FIVE CLASSES OF - IgA1015%(inblood) ,saliva,tears,andbreastmilk.Consideringthe bodyasawhole,.(serum

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