Blood leaving liver and moving to the heart has usually high concentration of

Options

A. Bile
B. Urea
C. Glycogen
D. Amino acid

Answer

To solve the question "Blood leaving liver and moving to the heart has usually high concentration of," we will analyze the options provided: bile, urea, glycogen, and amino acids. Here’s a step-by-step breakdown of the solution:

### Step-by-Step Solution:

1. **Understanding the Function of the Liver**:
- The liver is the largest organ in the human body and plays a crucial role in various metabolic processes, including detoxification, digestion, and excretion.

2. **Production of Bile**:
- The liver produces bile, which is essential for the digestion of fats. However, bile is stored in the gallbladder and released into the intestine, not directly into the bloodstream. Therefore, bile concentration in blood leaving the liver is not high.

3. **Urea Formation**:
- The liver is responsible for converting toxic ammonia (produced from protein metabolism) into urea through a process known as the urea cycle (or ornithine cycle). Urea is less toxic and is excreted from the body through urine. Blood leaving the liver has a high concentration of urea as it is a byproduct of protein metabolism.

4. **Glycogen Storage**:
- The liver stores glycogen, which is a form of glucose. However, glycogen itself is not present in high concentrations in the blood; rather, glucose is released into the bloodstream when needed.

5. **Amino Acids**:
- Amino acids are the building blocks of proteins and are present in the blood. However, the concentration of amino acids in blood leaving the liver is not as high as that of urea.

6. **Conclusion**:
- Based on the functions of the liver and the metabolic processes occurring within it, the blood leaving the liver and moving to the heart has a high concentration of **urea**.

### Final Answer:
The correct answer is **urea**.

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