The amount of urea which is excreted out in the urine per day of an adult human is

Options

A. 25 to 30 grams
B. 1 to 1.5 grams
C. 18 grams
D. 100 grams

Answer

To determine the amount of urea excreted in the urine of an adult human per day, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Composition of Urine**:
- Urine is primarily composed of water (approximately 95%).
- Urea constitutes about 2.5% of urine.
- The remaining 2.5% consists of other waste products.

2. **Identify Urea as the Major Excretory Product**:
- In humans, urea is the main nitrogenous waste product. This categorizes humans as ureotelic organisms, meaning urea is the primary form of nitrogen excretion.

3. **Determine the Average Daily Excretion of Urea**:
- Research and studies indicate that an adult human excretes approximately 25 to 30 grams of urea in urine each day.

4. **Conclude the Amount of Urea Excreted**:
- Based on the information, we can conclude that the average amount of urea excreted in the urine of an adult human per day is between 25 to 30 grams.

### Final Answer:
The amount of urea excreted in the urine per day of an adult human is approximately **25 to 30 grams**.

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