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Which reason is responsible for negative respiratory exchange ratio during gastric juice secretion in the stomach?

Options:

a. In metabolic alkalosis R decreases because more CO2 is retained in blood.
b. In metabolic acidosis R rises because more CO2 is expired out as compensation.
c. During hyperventilation R rises because CO2 is blown out.
d. During gastric juice secretion, R may become negative.

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