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ZingPath: Human Body Systems

An Organ of the Excretory System: Kidneys

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Lesson Focus

An Organ of the Excretory System: Kidneys


Learning Made Easy

You get to discover the major systems that allow the human body to function properly, and learn the important roles that each of these systems play. Some diseases and limitations of the human body are also discussed.

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Now You Know

After completing this tutorial, you will be able to complete the following:

  • Identify the principal structures of the excretory system, i.e. the kidneys, ureters, urinary bladder, and urethra.
  • Describe the function of the kidneys in excreting metabolic waste.

Everything You'll Have Covered

Which organs make up the excretory system?

~ The excretory system consists of the kidneys, ureter, urinary bladder, and urethra.

What are the primary organs of the excretory system and how many are there?

~ The kidneys are the primary organs of the excretory system and there are two, one on the right and one on the left rear sides of the abdominal cavity.

What is the kidney's main function?

~ The kidneys filter the blood with nephrons, removing excess water and waste molecules.

Describe how the excretory system works.

~ First, blood enters the kidneys through the renal artery and the kidneys filter the blood with nephrons. The cleaned blood returns to the circulatory system through the renal vein, and the filtered waste materials, such as urea, excess water, and salt from urine. The urine passes through the ureter and is stored in the urinary bladder. When the bladder is full, the urine leaves the body through the urethra.

Tutorial Details

Approximate Time 2 Minutes
Pre-requisite Concepts Students should be familiar with the terms: excretory system, kidneys, nephron, and renal artery.
Course Biology
Type of Tutorial Animation
Key Vocabulary excretory system, kidneys, nephron, renal artery