Differentiate between acute renal failure and chronic renal failure.

Explanation

### Step-by-Step Text Solution:

**1. Definition of Renal Failure:**
- Renal failure refers to a condition where the kidneys lose their ability to effectively filter waste products from the blood, leading to the accumulation of substances like urea in both blood and urine.

**2. Acute Renal Failure (ARF):**
- **Nature:** Acute renal failure is a sudden and rapid decline in kidney function.
- **Reversibility:** It is often reversible with appropriate medical intervention.
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