Human Organ Systems

Renal System: Kidneys and Bladder

This Kidney and Bladder MatchCard is one of the human organ systems in the Human Anatomy Unit Study for grades 3 - 8.

Free Download Below

renal system worksheet

Human Anatomy Unit Study

MatchCard Science Kidneys and Bladder Worksheet

Objective: Describe the functions of the major parts of the renal system.

MatchCard Information Pieces identify and describe the kidneys, ureters, bladder and urethra. Ideas for projects are listed on the instructor's page and below.

Download the Kidney and Bladder MatchCard

renal systemworksheet download arrow

This is MatchCard #8 of the Human Anatomy Unit Study.

The 1st page is the students' worksheet. The first page has human organi systems diagrammed in color..

The 2nd page is in black and white. Students may color the organs different colors.

The 3rd page is the Instructor's Guide with the correct answers.

The 4th page has the Information Pieces. Student's cut them apart and place them in the correct place on their copy of the Matchcard (first page.)

For more information on how to use the Matchcards, see the MatchCard Science Instructor's Guide.

The Kidneys

The renal system is one of the most important human organ systems. The kidneys filter waste products from the blood stream and secrete them as urine.

Where Are Your Kidneys?

Place your hands on your hips with your thumb pointing to the back and your fingers resting on your abdomen. Now slide your hands up until you find your rib cage.

Slide your hands up and down until your fingers are resting at the very bottom of the rib cage. Then hold them still.

Your thumbs are over your kidneys.

Size and Shape of Kidneys

Your kidneys are the same shape as a kidney bean. Hmmm, where do you think the kidney bean got its name, anyway?

A kidney is somewhat crescent shaped - like a quarter moon that is full of fluid. It really is an interesting and unique shape.

Your kidney is about 2/3 the size of your hand. You can now see the size, shape, and location of your kidneys.

Project: The Kidney as a Filter

For this project you will need: Ready to begin?
The kidneys filter the blood the same as the coffee filter cleaned the water. Larger particles of waste are separated from the fluid since they can't go through the small holes in the filter.

More Kidney Facts for Kids

Which of those functions of the kidney do you think are important? I hope you said all of them, because they are all essential to life. Do you see why we say it is one of the most important human organ systems?

3 Other Parts of the Renal System

Human Renal Systems


The ureters are two tubes that carry the urine to the bladder. There is one ureter attached to each kidney.

The urine is drained by gravity down the ureter.


The bladder is a muscular pouch low in the pelvis. Urine is constantly being made by the kidneys and sent drip by drip down the ureter.

Don't you hate to think what life would be like if you didn't have a bladder to hold the urine?

Once the bladder is full, the brain sends a message to the person that they need to urinate. Let's hope there's not a long line at the bathroom.


The urethra is the tube that takes the urine from the bladder to the outside of the body. When a person urinates the bladder contracts (or squeezes). The urethra relaxes and lets the urine flow out.

Experiment: Timing the Renal System

How Long Does It Take to Run Through

Some fluids are diuretics. That means they make the kidneys work faster, and hence you void faster (void is the nice way to see "pee").

Here is an experiment that you can do to time how fast it takes for fluid to go in and then out.

That was pretty lame. We are going to take it up a notch with some known diuretics. Test which of these might be diuretics:

Hmmm, sounds like you could have fun in the name of advancing science. A hypothesis could be developed to make this a bonafide science fair experiment - but I don't think you really want to go there, do you?

The Other Human Organ Systems

MatchCard Science has 12 human organ systems. These include:
  • From Cells to Systems
  • Digestive system.
  • Tooth model and tooth decay
  • Respiratory system
  • Cardiovascular
  • Skeletal System
  • Muscles and joints
  • Nervous System
  • Anatomy of the Eye
  • Human ear
  • Skin
  • Endocrine System

  • MatchCard Science

    How To Use MatchCards


    MatchCards make science concepts and corresponding vocabulary interactive. As students move the information pieces on the MatchCards they review the material they have already learned.

    Download the FREE MatchCard Science Instructor's Guide and see how MatchCards can make building their science knowledge base fun.

    Human Anatomy Unit Study

    Human Anatomy Unit Study Cover

    From cells to systems, kids will learn learn fun things about how their body works. 12 different human anatomy systems are covered.

    Download the entire Human Anatomy Unit Study

    12 Science Unit Studies

    MatchCard Science Cover

    Chemistry is only one of twelve complete unit studies for kids in 3rd to 8th grade.

    Comprehensive objectives, hands-on projects, suggested science fair experiments, and the fun game-like MatchCards keep them interested in learning science. See all twelve MatchCard Science Unit Studies.

    Ready To Use Resources

    Literature Unit Study Box Literature Unit Study Box Literature Unit Study Box

    Top of This Page

    About Our Site

    Hands-On Learning

    homeschool curriculum sign
    See All Products

    GreatBlueHeron Egret

    HOME | Our Curriculum | Contact Us | Site Map | Privacy Policy | Affiliates | About Us |

    By Karen Newell Copyright© 2009 - 2023 Learn For Your Life All Rights Reserved

    New Pages Site Map Contact About Us