At a high altitude where atmospheric pressure is halved, there is an i

1.	At a high altitude where atmospheric pressure is halved, there is an increase in A. Pulmonary ventilation. B. Alveolar H2O vapour pressure. C. Arterial PO2. D. Arterial pH. E. Cerebral blood flow
Answer» A. True Due to stimulation of chemoreceptors by oxygen lack. B. False This remains at the saturated pressure at body temperature. C. False The fall in arterial P_O2 stimulates the carotid bodies to increase ventilation. D. True Hyperventilation causes respiratory alkalosis. E. False The fall in P_CO2 causes cerebral vasoconstriction.

At a high altitude where atmospheric pressure is halved, there is an increase in A. Pulmonary ventilation. B. Alveolar H2O vapour pressure. C. Arterial PO2. D. Arterial pH. E. Cerebral blood flow

Answer»

A. True Due to stimulation of chemoreceptors by oxygen lack.

B. False This remains at the saturated pressure at body temperature.

C. False The fall in arterial P_O2 stimulates the carotid bodies to increase ventilation.

D. True Hyperventilation causes respiratory alkalosis.

E. False The fall in P_CO2 causes cerebral vasoconstriction.

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At a high altitude where atmospheric pressure is halved, there is an increase in A. Pulmonary ventilation. B. Alveolar H2O vapour pressure. C. Arterial PO2. D. Arterial pH. E. Cerebral blood flow

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