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The liver detoxifies your blood. “Almost all the blood in your body passes through the liver. As blood passes through the liver, it breaks down substances, such as prescription or over-the-counter drugs, street drugs, alcohol, and caffeine. Our bodies naturally produce some harmful (toxic) chemicals or poisons, and those are also broken down by the liver. In this way the liver acts as a filter to clean your blood.”


From US Dept of Veterans Affairs, “VA » Health Care » Viral Hepatitis » Veterans and Public Home » Liver Basics » Liver as Filter”

The liver produces bile, a kind of detergent that breaks up fat into small particles. Stored in the gallbladder, and then released when you are digesting a meal. Bile allows the body to digest fat.

The liver takes excess sugars, and links them together into a large molecule called glycogen. Liver then stores glycogen until energy is needed.

glycogen glucose

Image from National 5 Biology, nat5biopl.edubuzz.org

The liver makes cholesterol.


Kidshealth.org – Liver


Sample questions

Laboratory tests can be used to evaluate how well a person’s liver is working. One test measures how well the liver removes a substance called bilirubin from the blood. Based on this information, which of the following describes bilirubin?
A. an antibody
B. an energy source
C. a vitamin
D. a waste product

Learning Standards


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