How much blood is fitered by the kidneys per minute ?

Options

A. 125 mL
B. 500 mL
C. 1100mL
D. 5000mL

Answer

To determine how much blood is filtered by the kidneys per minute, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Role of Kidneys**:
- The kidneys are the major excretory organs in humans, responsible for filtering blood to remove waste products and excess substances.

2. **Blood Supply to the Kidneys**:
- The kidneys receive blood from the heart. The heart pumps blood throughout the body, including to the kidneys, primarily for the purpose of filtration.

3. **Filtration Process**:
- Within the kidneys, the functional units called nephrons carry out the filtration process. Each nephron consists of structures such as the glomerulus, proximal convoluted tubule, loop of Henle, and distal convoluted tubule.

4. **Amount of Blood Filtered**:
- It is established that the kidneys filter approximately 1100 to 1200 ml of blood per minute. This amount represents about one-fifth of the total blood volume that the heart pumps out.

5. **Evaluating the Options**:
- Given the options:
- 125 ml (incorrect)
- 500 ml (incorrect)
- 1100 ml (correct)
- 5000 ml (incorrect)
- The correct answer is 1100 ml, as it falls within the range of 1100 to 1200 ml.

### Final Answer:
The kidneys filter approximately **1100 to 1200 ml** of blood per minute.

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