The RQ for a resting human adult is approximately 0.85. If he/she undertake violent exercise for 3 to 5 minutes:

Options

A. RQ will rise.
B. RQ will fall.
C. RQ will remain same.
D. RQ will fall and then rise.

Answer

**Step-by-Step Solution:**

1. **Understanding RQ (Respiratory Quotient):**
- The respiratory quotient (RQ) is a measure of the ratio of carbon dioxide produced to oxygen consumed during respiration. For a resting human adult, the RQ is approximately 0.85.

2. **Effect of Exercise on Oxygen Consumption:**
- During violent exercise, the body requires more energy, which leads to an increase in oxygen consumption. This is because the muscles are working harder and need more oxygen to produce energy.

3. **Effect of Exercise on Carbon Dioxide Production:**
- As the oxygen consumption increases, the cells also produce more carbon dioxide as a byproduct of increased metabolic activity. Therefore, the volume of carbon dioxide released into the bloodstream will also increase.

4. **Calculating the Change in RQ:**
- Since RQ is defined as the ratio of carbon dioxide produced to oxygen consumed, if both the oxygen consumption increases and the carbon dioxide production increases, the RQ will change accordingly.
- Specifically, if carbon dioxide production increases at a higher rate than oxygen consumption, the RQ will rise.

5. **Conclusion:**
- After undertaking violent exercise for 3 to 5 minutes, the RQ for a human adult will rise due to the increased production of carbon dioxide relative to the oxygen consumed.

**Final Answer:**
The RQ will rise after a resting human adult undertakes violent exercise for 3 to 5 minutes.

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