Respiration rate is lowest during

Options

A. Running
B. Playing
C. Eating
D. Sleeping

Answer

To determine when the respiration rate is lowest among the given options (running, playing, eating, sleeping), we can analyze each activity in relation to metabolic rates and respiration.

### Step-by-Step Solution:

1. **Understand Respiration Rate**:
- Respiration rate refers to the number of breaths taken per minute. It is an indicator of how much oxygen the body is using and how much carbon dioxide is being expelled.

2. **Identify Average Respiration Rate**:
- In a healthy adult, the average respiration rate is typically between 12 to 20 breaths per minute.

3. **Consider the Activities**:
- **Running**: This is a high-intensity activity that increases metabolic rate, leading to a higher respiration rate to supply more oxygen to the muscles.
- **Playing**: Similar to running, playing (especially active games) also requires increased energy, resulting in a higher respiration rate.
- **Eating**: While eating does involve some metabolic activity, it does not significantly elevate the respiration rate compared to physical activities like running or playing.
- **Sleeping**: During sleep, the body is at rest, and metabolic activities are at their lowest. Consequently, the respiration rate decreases significantly.

4. **Conclusion**:
- Among the options provided, the respiration rate is lowest during **sleeping**.

### Final Answer:
- The respiration rate is lowest during **sleeping** (Option D).

---