This model shows how kidneys filter our blood. The red-colored water in the first syringe is like blood with waste. It passes through a cotton filter in the second syringe, just like nephrons in the kidney filter out waste. Clean water (urine) is collected in the third syringe and stored in a bladder bottle, showing the body’s natural purification system.
Objective:
To show how human kidneys filter blood, remove waste, and produce urine, using a functional syringe-based model.
Materials Required:
| Item | Use |
|---|---|
| 3 Syringes (20ml or 50ml) | To simulate kidney filtration and urine flow |
| Transparent pipes (IV tubes or small plastic tubes) | For fluid flow between syringes |
| Plastic bottle (cut) | Acts as waste collector (urinary bladder) |
| Red & yellow food color | To represent dirty blood and clean filtrate |
| Cotton or tissue | To simulate the nephron filter |
| Cardboard | Base and backdrop |
| Marker pens / color paper | For labeling (kidney, nephron, ureter etc.) |
| Glue gun or tape | For fixing components |
| Paint or sketch pens | To decorate & make it visually appealing |
Model Design Overview:
- Syringe 1: Represents blood with waste (Red-colored water).
- Syringe 2: Filters water through cotton (Nephron).
- Syringe 3: Collects the filtered fluid (urine).
- A pipe connects Syringe 1 → Syringe 2 → Syringe 3 → Waste collector bottle.
Video Step-by-Step Instructions:
Step 1: Prepare the Syringes
- Syringe 1 (Dirty Blood Source):
- Fill with red colored water (add some dust or coffee powder to simulate urea).
- Syringe 2 (Kidney Filter):
- Put a small piece of cotton or tissue inside the nozzle (acts as a nephron filter).
- Syringe 3 (Urine Collector):
- Empty syringe to collect the filtered water (urine simulation).
Step 2: Connect the System
- Pipe 1: Connect Syringe 1 to Syringe 2.
- Pipe 2: Connect Syringe 2 to Syringe 3.
- Optionally add a third pipe from Syringe 3 to a small bottle to simulate urine bladder.
Step 3: Mount and Decorate
- Fix all components on a cardboard base.
- Use another vertical cardboard piece as backdrop for kidney shape cutout.
- Decorate with color paper and labels:
- “Renal Artery” (Syringe 1)
- “Nephron Filter” (Syringe 2)
- “Ureter” (Pipe to Syringe 3)
- “Urinary Bladder” (plastic bottle)
How It Works:
- Push Syringe 1 – dirty (colored) water flows into Syringe 2.
- Syringe 2 filters the water using cotton, removing particles.
- Clean (yellow-colored) water flows to Syringe 3, simulating urine.
- This water is collected in the bladder bottle.