Question

Oxygen debt is 

A. The amount of O₂ consumed after cessation of exercise. 

B. Incurred because the pulmonary capillary walls limit O₂ uptake during exercise. 

C. Possible since skeletal muscle can function temporarily without oxygen. 

D. Associated with a rise in blood lactate. 

E. Associated with metabolic acidosis. 

Answer 1

A. False It is the amount of O₂ in excess of resting needs consumed after exercise stops. 

B. False O₂ uptake across pulmonary capillary walls is not usually diffusion limited. 

C. True The O₂ debt incurred during anaerobic metabolism is repaid later. 

D. True This is generated during anaerobic metabolism. 

E. True Due to the lactic acid, blood HCO₃^-  falls as the lactic acid is buffered.