Respiratory alkalosis differs from metabolic alkalosis in that the

 A. False   Both kinds of alkalosis may result in tetany.

B. False   It is likely to be alkaline in both.

C. True   [HCO3 ] is raised in metabolic alkalosis but falls to compensate for the low PCO2 in respiratory alkalosis.

D. True   PCO2 is reduced in respiratory alkalosis but rises to compensate for the high [H2CO3 ] in metabolic alkalosis.

E. True   The greater fall in PCO2 in respiratory alkalosis causes more cerebral vasoconstriction