Draw a labelled diagram showing reabsorption and secretion of major substances at different parts of the nephron.

Explanation

### Step-by-Step Solution:

1. **Understanding the Nephron Structure**:
- The nephron is the functional unit of the kidney, consisting of several parts: Bowman's capsule, proximal convoluted tubule (PCT), loop of Henle, distal convoluted tubule (DCT), and collecting duct.

2. **Drawing the Diagram**:
- Start by sketching the kidney shape, indicating the cortex (outer region) and medulla (inner region).
- Inside the kidney, draw a nephron with the following parts:
...