In ornithine cycle, which of the following wastes are removed from the blood –

Options

A. `CO_(2)` and ammonia
B. Ammonia and urea
C. `CO_(2)` and urea
D. Urea and urine

Answer

### Step-by-Step Solution:

1. **Understanding the Ornithine Cycle**: The ornithine cycle, also known as the urea cycle, is a series of biochemical reactions that occur primarily in the liver. Its main function is to convert ammonia, which is highly toxic, into urea, which is less toxic and can be safely excreted from the body.

2. **Components of the Cycle**: The cycle involves the conversion of two molecules of ammonia (NH3) and one molecule of carbon dioxide (CO2) into urea ((NH2)2CO). This transformation is crucial for detoxifying ammonia, which is a byproduct of protein metabolism.

3. **Identifying the Wastes Removed**: In the context of the ornithine cycle, the wastes that are removed from the blood include:
- Ammonia (NH3): This is converted into urea during the cycle.
- Carbon Dioxide (CO2): This is also a byproduct of the reactions in the cycle.

4. **Final Product**: The end product of the ornithine cycle is urea, which is then transported to the kidneys for excretion. While urea itself is not directly removed from the blood during the cycle, its precursors (ammonia and carbon dioxide) are.

5. **Conclusion**: Based on the above understanding, the correct answer to the question regarding which wastes are removed from the blood in the ornithine cycle is **carbon dioxide and ammonia**.