Find the value of RQ when respectively carbohydrates and proteins are used in respiration.

Answer

To find the value of the Respiratory Quotient (RQ) when carbohydrates and proteins are used in respiration, we can follow these steps:

### Step-by-Step Solution:

1. **Understand RQ**: The Respiratory Quotient (RQ) is defined as the ratio of the volume of carbon dioxide (CO2) produced to the volume of oxygen (O2) consumed during respiration. It can be expressed mathematically as:
\[ RQ = \frac{\text{Volume of CO2 evolved}}{\text{Volume of O2 consumed}} \]

2. **Identify the RQ for Carbohydrates**: When carbohydrates are used as the respiratory substrate, the RQ value is known to be 1. This means that the amount of CO2 produced is equal to the amount of O2 consumed.

3. **Identify the RQ for Proteins**: When proteins are used as the respiratory substrate, the RQ value is approximately 0.8. This indicates that for every unit of O2 consumed, less CO2 is produced compared to carbohydrates.

4. **Summarize the RQ Values**: Based on the above information, we can summarize the RQ values:
- For carbohydrates: RQ = 1
- For proteins: RQ = 0.8

5. **Final Answer**: Therefore, the values of RQ when carbohydrates and proteins are used in respiration are:
- Carbohydrates: 1
- Proteins: 0.8