Name the procedure used in the working of an artificial kidney

Explanation

### Step-by-Step Solution:

1. **Understanding the Need for an Artificial Kidney**:
- An artificial kidney is used when the natural kidneys fail to function properly, a condition known as renal failure. In renal failure, the kidneys are unable to remove waste products from the blood, leading to a dangerous accumulation of toxins.

2. **Identifying the Procedure**:
- The procedure used in the working of an artificial kidney is called **hemodialysis**. This process is essential for purifying the blood when the kidneys cannot perform this function.

...