How to Experiment with Coffee Filters to Explain How a Kidney Works

Use a coffee filter to demonstrate how kidneys work.
••• Jupiterimages/Photos.com/Getty Images

Our kidneys help keep us healthy by removing toxins from our blood: The renal artery brings blood into the kidneys which then process the blood, removing any unwanted substances and eliminating the waste in the urine. The kidneys then return the processed blood to the body through the renal vein. Health professionals, educators and students can use everyday kitchen equipment to create a simple experiment that clearly demonstrates the basic workings of the kidneys.

    Mix 1/2 spoonful of crushed chalk with 1/2 cup of water in a clear glass jar. Add a few drops of food coloring to the water. The chalk will represent toxins present in the blood, while the water will represent the blood.

    Place a coffee filter over the top of the second jar and secure it with a rubber band. The filter will represent the kidneys that filter the toxins from the blood.

    Pour the chalk/water mixture through the coffee filter into the second jar.

    Observe how the filter traps the chalk as the colored water drips into the second jar. This helps illustrate how blood circulates through the kidneys, which then trap the toxins before returning the purified blood to the body's circulatory system.

    Things You'll Need

    • Clear glass jars
    • Sand
    • Water
    • Food coloring

Related Articles

Project Ideas to Show the Human Digestive System in...
Easy Kidney Science Projects
Excretory System Science Project Ideas
Five Major Organ Systems of the Body
Easy Kidney Science Projects
How Do the Respiratory & Cardiovascular System Work...
How to Compare the Anatomy of a Beef Heart & a Human...
Science Projects on Smoking
Human Heart Science Projects
Lymphatic System Science Activities
Body Parts & Functions
How to Neutralize Food Coloring in Water
Top Ten Facts About the Human Bladder
Project Ideas to Show the Human Digestive System in...
How to Test for Acidity With Litmus Paper
How to Measure the Acidity of Fruits
How to Float an Egg in Water
Examples of Diffusion in Organs
Functions of Human Organs