12.7 - Respiratory Substrates Flashcards
The respiration of lipids and proteins Comparing the energy values of respiratory substrates Calculating and interpreting respiratory quotients
What are alternative respiratory substrates?
Substances other than glucose that can be oxidized for energy
How are lipids used as respiratory substrates?
Hydrolyzed into glycerol and fatty acids
How are proteins used as respiratory substrates?
Hydrolyzed into amino acids
Why are amino acids used as a last resort for energy?
They have other important functions
Which respiratory substrate has the highest energy yield?
Lipids
Which respiratory substrate has the lowest energy yield?
Carbohydrates
What is the respiratory quotient (RQ)?
Ratio of CO2 produced to O2 consumed
What is the formula for RQ?
RQ = volume of CO2 produced / volume of O2 consumed
What does an RQ of 1.0 indicate?
Carbohydrate respiration
What does an RQ of 0.7 indicate?
Lipid respiration
What does an RQ of 0.9 indicate?
Protein respiration
What does an RQ of more than 1 indicate?
Anaerobic respiration
