Time required for the flow of entire blood through kidneys in general

Options

A. 1 minute
B. 4 to 5 minutes
C. 10 minutes
D. 2 minutes

Answer

To determine the time required for the entire blood volume to flow through the kidneys, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Total Blood Volume**:
- The average total blood volume in an adult human body is approximately 5.5 to 6 liters.

2. **Identify Renal Blood Flow**:
- Renal blood flow refers to the volume of blood that reaches the kidneys per unit time. In adults, the kidneys receive about 25% of the cardiac output.

3. **Calculate Cardiac Output**:
- The average cardiac output for an adult is about 5 to 6 liters per minute. Therefore, 25% of this would be the blood flow to the kidneys.
- Calculation:
- 25% of 5.5 to 6 liters = 1.375 to 1.5 liters per minute.

4. **Determine Time for Entire Blood Volume to Pass Through**:
- To find out how long it takes for the entire blood volume (5.5 to 6 liters) to pass through the kidneys, we can use the renal blood flow rate.
- If the kidneys receive approximately 1.2 to 1.3 liters of blood per minute, we can calculate the time required for the entire blood volume to pass through.
- Calculation:
- Time = Total Blood Volume / Renal Blood Flow Rate
- Using 1.2 to 1.3 liters per minute:
- For 5.5 liters: 5.5 liters / 1.2 liters/minute = approximately 4.58 minutes
- For 6 liters: 6 liters / 1.3 liters/minute = approximately 4.62 minutes

5. **Conclusion**:
- Therefore, the entire blood volume of the body passes through the kidneys in approximately 4 to 5 minutes.

### Final Answer:
The time required for the entire blood volume to flow through the kidneys is approximately **4 to 5 minutes**.

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