Question

The respiratory quotient 

A. Is the ratio of the volume of O₂ consumed to the volume of CO₂ produced. 

B. Depends essentially on the type of substrate being metabolized. 

C. Is 1.0 when glucose is the substrate metabolized. 

D. Is between 0.9 and 1.00 in the second week of fasting. 

E. For the brain is around 1.0.

Answer 1

A. False It is the inverse of this ratio. 

B. True The respiratory quotients for carbohydrate, fat and protein metabolism are different. 

C. True C₆H₁₂O₆ + 6O₂ = 6CO₂ + 6H₂O; each molecule of O₂ consumed results in the production of one molecule of CO₂. 

D. False It approaches 0.7, the value when fat is the main substrate being metabolized. 

E. True Carbohydrate is the main substrate for brain metabolism.