The amino acid that plays an important role in the gastrointestinal tract during stress is
a. arginine.
b. glutamine.
c. methionine.
d. phenylalanine.
B
During stress, glutamine is mobilized in large quantities from skeletal muscle and lung to be used directly as a fuel source by intestinal cells. Glutamine also plays a significant role in maintaining intestinal immune function and enhancing wound repair by supporting lymphocyte and macro-phage proliferation, hepatic gluconeogenesis, and fibroblast function. Arginine has a role in maintaining immune function in the gastrointestinal tract but is not as critical in stress as gluta-mine. Methionine and phenylalanine do not have specific roles during stress.
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