Respiratory disease can limit exercise by halving the

A. True This may occur in severe obstructive or restrictive disease.

B. True This may occur in obstructive disease such as asthma.

C. False Unless resting oxygen requirements are met, death results immediately.

D. False The oxygen carrying capacity of blood often rises in respiratory disease because of polycythaemia; desaturation of haemoglobin is the usual cause of hypoxia in respiratory disease.

E. False Pulmonary blood flow equals cardiac output, which tends to rise in respiratory disease.