Human organ systems
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Human Organ Systems. The Excretory System. What is the function of the Excretory system?. The job of the excretory system is to remove metabolic wastes from your body. Metabolic wastes are those that are created by the life processes within your cells.

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Human Organ Systems

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Human organ systems

Human Organ Systems

  • The Excretory System


What is the function of the excretory system

What is the function of the Excretory system?

  • The job of the excretory system is to remove metabolic wastes from your body.

  • Metabolic wastes are those that are created by the life processes within your cells.

  • Remember that the wastes removed from your body by your digestive system (Feces) are not considered metabolic wastes.


The rule of 4

The rule of 4

  • For this organ system, 4 is a magic number to remember.

  • For instance, there are 4 metabolic wastes created by your body.

    • Water

    • Carbon dioxide

    • Salts

    • Urea


More on 4

More on 4

  • Not only are there four metabolic wastes, there are 4 organs* that remove these wastes.

    • SkinLungs Liver Kidneys*

      *(There are actually 4 components which make up our urinary system.)

      1. Kidneys

      2. Ureters

      3. Urinary bladder

      4. Urethra


The skin

The Skin

  • The largest organ in your body, the skin gets rid of metabolic wastes in the form of sweat.

  • Sweat consists of water, salts and urea.

  • The sweat is formed in specialized sweat glands in your skin.


The liver

The Liver

  • While your liver does not excrete anything from your body, it is responsible for filtering your blood and forming a nitrogenous waste called urea.

  • Once formed, the urea is then secreted back into your blood.

  • It’s molecular formula is (NH2)2CO2

  • Thought question: Since Urea is a nitrogenous compound, from which component of human nutrition is this waste derived from?


The lungs

The Lungs

  • Your lungs help to get rid of two metabolic wastes:

    • CO2

    • H2O

    • These wastes diffuse from the capillaries in your alveoli.

Normal lung

Lung Cancer

Emphysema Lung


The urinary system

The urinary system

  • This system consists of 4 components.

  • 1. Your Kidneys: You kidneys filter your blood and remove Urea, excess water and salts. These are combined to form Urine.

  • 2. The ureters are tubes that transfer urine from the kidneys to the urinary bladder.

  • 3. The urinary bladder is a temporary holding sac for urine.

  • 4. The urine leaves your body through your uretha. In males, the urethra is also part of the reproductive system.


Quik quiz

Quik quiz

  • Please turn over your note worksheet and try to answer the following questions.

  • 1. Name the four metabolic wastes.

  • 2. Name the four organs involved in excretion.

  • 3. Where are metabolic wastes created?

  • 4. Which chemical reaction(s) in your body produces water?

  • 5. Which chemical reaction produces salt?


Excretion summary

Excretion Summary


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