<prompt> Acute metabolic acidosis: AI 2002Has biphasic effect on K excretionDoes not effect K excretionDecreases urinary K excretionIncrease urinary K excretion  <response>: Ref: Harrisons 18e p366 When H concentration is increased as in acidosis, H ions are secreted preferentially over K ions in exchange of NaThus in acidosis K secretion into tubules excretion is inhibited 