List the parts of the blood system through which urea passes from the liver to the kidney?

Explanation

To explain the path through which urea passes from the liver to the kidney, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Urea Formation in the Liver**:
- Urea is synthesized in the liver as a result of protein metabolism.

2. **Transport via Hepatic Vein**:
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