The structural and functional unit of liver is

Options

A. Cystic duct
B. Hepatic lobule
C. Hepatopancreatic duct
D. Sphincter of Oddi

Answer

The structural and functional unit of the liver is the **hepatic lobule**.

### Step-by-Step Solution:

1. **Understanding the Liver's Structure**: The liver is the largest organ in the human body and is divided into two main lobes. Each lobe consists of smaller functional units.

2. **Identifying the Functional Unit**: The liver's functional unit is made up of structures called hepatic lobules. These lobules are analogous to how neurons function in the nervous system or nephrons in the kidneys.

3. **Role of Hepatic Lobules**: Each hepatic lobule contains various cells, including hepatocytes, which are responsible for many of the liver's functions, such as metabolism, detoxification, and blood filtration.

4. **Comparison with Other Structures**: Other options like the cystic duct, hepato-pancreatic duct, and sphincter of Oddi are associated with the liver but do not serve as its structural and functional units. The cystic duct is related to the gallbladder, the hepato-pancreatic duct connects the liver and pancreas, and the sphincter of Oddi is involved in the regulation of bile and pancreatic juice flow into the duodenum.

5. **Conclusion**: Therefore, the correct answer to the question is that the structural and functional unit of the liver is the **hepatic lobule**.