The respiratory quotient (RQ) of different respiratory substrates can be calculated using the formula:
RQ=Volume of carbon dioxide producedVolume of oxygen consumed\text{RQ} = \frac{\text{Volume of carbon dioxide produced}}{\text{Volume of oxygen consumed}}RQ=Volume of oxygen consumedVolume of carbon dioxide produced
The table below gives the standard RQ values for three pure respiratory substrates:
| Substrate | Standard RQ value |
|---|---|
| Glucose (Carbohydrate) | 1.0 |
| Protein | 0.8 |
| Lipid | 0.7 |
In an investigation into the respiration of a sample of tissue, the following measurements were recorded:
Calculate the RQ for this tissue sample and suggest which combinations of respiratory substrates were being used.