When a nurse is checking the urinalysis, plasma proteins should be absent from the urine because:
a. all filtered proteins are subsequently reab-sorbed.
b. the texture of the covering surrounding plasma proteins interferes with reabsorp-tion.
c. filtered proteins are subsequently degrad-ed before elimination.
d. the negative charge of the glomerular fil-tration membrane repels the plasma pro-teins.
ANS: D
Like other capillary membranes, the glomerulus is freely permeable to water and relatively im-permeable to large colloids, such as plasma proteins. The molecule's size and electrical charge af-fect the permeability of substances crossing the glomerulus. Protein filtration is not as dependent on size, texture, or on degradation.
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