How can you make working model of kidney?

To make a working model of a kidney, you can use the following steps:

Materials:

- 2 clear plastic bottles

- 2 rubber bands

- 2 straws

- 2 pieces of sponge

- Water

- Food coloring (optional)

Procedure:

1. Cut the bottoms off of both plastic bottles.

2. Place one piece of sponge in the bottom of each bottle.

3. Stretch a rubber band around the top of each bottle, covering the sponge.

4. Insert a straw into the center of each sponge, so that the straw extends into the bottle.

5. Cut the tops of both straws so that they are about the same length.

6. Connect the straws by pushing the end of one straw into the other straw.

7. Place the two bottles side by side, with the straws facing each other.

8. Fill one bottle with water (this represents the blood plasma).

9. Add a few drops of food coloring to the water in the other bottle (this represents the solutes in the blood).

10. Observe the water and food coloring moving through the straws. This demonstrates how the kidneys filter waste products from the blood.

Explanation:

The plastic bottles represent the kidneys, the sponges represent the glomeruli, the straws represent the renal tubules, and the water represents the blood plasma. The food coloring represents the waste products in the blood. As the water flows through the sponges and straws, the food coloring is filtered out, just like the kidneys filter waste products out of the blood.

This model can help to demonstrate how the kidneys function to filter waste products from the blood and produce urine.