which of the following metabolic waste is removed via orrythin cycle in human

Options

A. NH_2
B. CO_2
C. Uric acid
D. both (1) & (2)

Answer

To solve the question regarding which metabolic waste is removed via the ornithine cycle in humans, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Ornithine Cycle**: The ornithine cycle, also known as the urea cycle, is a series of chemical reactions that occur in the liver. Its primary function is to convert ammonia, a toxic byproduct of protein metabolism, into urea, which is less toxic and can be safely excreted from the body.

2. **Identify the Waste Products**: The main waste product of the ornithine cycle is urea. During this cycle, ammonia (NH₃) is converted into urea (NH₂)₂CO. Additionally, carbon dioxide (CO₂) is also produced as a byproduct of this cycle.

3. **Recognize the Role of the Liver**: The liver's hepatocytes (liver cells) are responsible for carrying out the reactions of the ornithine cycle. This process is crucial for detoxifying ammonia, which is generated from the breakdown of amino acids.

4. **Determine the Excretion Pathway**: Once urea is formed, it is transported to the kidneys, where it is filtered out of the blood and excreted in urine. This is an essential process for maintaining nitrogen balance in the body.

5. **Evaluate the Options**: In the context of the question, we need to identify which metabolic waste is specifically removed via the ornithine cycle. The options include:
- Urea
- Uric acid
- Ammonia
- Carbon dioxide

From our understanding, urea is the primary waste product removed via the ornithine cycle. Uric acid is not produced in this cycle; it is primarily excreted by birds and some reptiles. Ammonia is converted into urea in the cycle, and while carbon dioxide is a byproduct, it is not the main waste product being removed.

6. **Select the Correct Answer**: Based on the analysis, the correct metabolic waste removed via the ornithine cycle in humans is **urea**.