The number of uriniferous tubles in each kidney of mass is

Options

A. About 10,000
B. About 5,000
C. Numberous
D. About `1.0 xx 10^(6)`

Answer

To solve the question regarding the number of uriniferous tubules (nephrons) in each kidney of a human, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Structure of the Kidney**:
- The kidney is an essential excretory organ in the human body. It plays a crucial role in filtering blood and producing urine.

2. **Identifying the Functional Unit**:
- The nephron is the structural and functional unit of the kidney. It is also referred to as the uriniferous tubule.

3. **Components of the Nephron**:
- Each nephron consists of several parts:
- **Renal Corpuscle**: Contains the Bowman's capsule.
- **Proximal Tubule**: Divided into proximal convoluted tubule and proximal straight tubule.
- **Loop of Henle**: A U-shaped portion of the nephron.
- **Distal Convoluted Tubule**: The segment following the loop of Henle.
- **Collecting Duct**: The final part of the nephron where urine is collected.

4. **Determining the Number of Nephrons**:
- The average number of nephrons in each kidney of a human is approximately \( 1.0 \times 10^6 \) (1 million).

5. **Evaluating the Options**:
- Given the options:
- 10,000 (incorrect)
- 5,000 (incorrect)
- Numerous (incorrect)
- \( 1.0 \times 10^6 \) (correct)
- The correct answer is \( 1.0 \times 10^6 \).

### Final Answer:
The number of uriniferous tubules (nephrons) in each kidney of a human is approximately \( 1.0 \times 10^6 \).

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