Explain, why a haemodialysing unit called “artificial kidney”?

A haemodialysing unit is often referred to as an "artificial kidney" because it performs many of the same functions as a healthy, natural kidney. Here's a step-by-step explanation:

1. Filtration: Just like kidneys, the haemodialysing unit filters waste products, excess salt, and water from the blood. This is the primary function of the kidneys and the main reason dialysis is needed for people with kidney failure.

2. Removal of waste products: The kidneys remove waste products from the metabolism, such as urea and creatinine, from the blood. The haemodialysing unit does the same thing.

3. Electrolyte balance: The kidneys help maintain the balance of electrolytes in the body, such as potassium and sodium. The haemodialysing unit also helps regulate these electrolytes in patients undergoing dialysis.

4. Acid-base balance: The kidneys maintain the pH balance of the body by excreting hydrogen ions and reabsorbing bicarbonate from urine. The haemodialysing unit can't do this as effectively as healthy kidneys, but it does help to some extent.

So, because the haemodialysing unit performs these key kidney functions, it's often referred to as an "artificial kidney." However, it's important to note that it's not a perfect replacement for natural kidneys and can't fully replicate all the functions of a healthy kidney.