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

Options

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

Answer

### Step-by-Step Solution:

1. **Understanding the Ornithine Cycle**: The Ornithine cycle, also known as the urea cycle, is a biochemical process that occurs primarily in the liver. Its main function is to convert toxic ammonia, a byproduct of protein metabolism, into urea, which is less toxic and can be excreted from the body.

2. **Identifying Waste Products**: In the Ornithine cycle, the primary waste product that is removed from the blood is ammonia. Ammonia is a toxic compound that needs to be converted into a less harmful substance.

3. **Conversion Process**: The cycle begins with the incorporation of ammonia into the cycle, where it is converted into urea. Urea is then transported to the kidneys, where it is excreted in urine.

4. **Additional Waste Products**: Besides ammonia, carbon dioxide (CO2) is also produced as a byproduct during the conversion process. CO2 is released into the blood and eventually exhaled through the lungs.

5. **Final Waste Products**: The two main waste products removed from the blood in the Ornithine cycle are ammonia and carbon dioxide. Urea itself is not directly removed from the blood; instead, it is formed and then excreted later.

6. **Conclusion**: Therefore, the correct answer to the question regarding which wastes are removed from the blood in the Ornithine cycle is ammonia and carbon dioxide.