John halves his tidal volume and doubles his respiratory rate. Which of the following would this result in? W. alveolar ventilation is unchanged X. dead space is unchanged Y. arterial PCO2 is unchanged Z. pulmonary (minute) ventilation is unchanged Select one: O a. if only W, X and Y are correct O b. if only W and Y are correct O c. if only X and Z are correct O d. if only Z is correct O e. if all are correct

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