Where do ultrafiltration, reabsorption and secretion occur in a nephron?

Explanation

To answer the question regarding where ultrafiltration, reabsorption, and secretion occur in a nephron, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding the Nephron**:
- The nephron is the functional unit of the kidney responsible for filtering blood and producing urine. It consists of several parts, each with specific functions.

2. **Ultrafiltration**:
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