Human Body Systems Quiz

Grade 5 · Science · Quiz

Test your knowledge of the major organ systems and how they keep the human body functioning.

Questions

1. Which organ pumps blood throughout the body?

   1. Lungs
   2. Brain
   3. Heart
   4. Liver
   Show answer

   Answer: Heart

   The heart is the pump of the circulatory system, beating about 100,000 times per day to keep blood flowing.

2. The respiratory system's main job is to digest food.

   Show answer

   Answer: False

   The respiratory system exchanges gases — bringing oxygen in and removing carbon dioxide. Digestion is the job of the digestive system.

3. The ___ system controls and coordinates all functions of the body using electrical signals.

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   Answer: nervous

   The nervous system uses electrical impulses traveling through neurons to control everything from heartbeat to thought and movement.

4. Which system includes the stomach, intestines, and liver?

   1. Circulatory
   2. Digestive
   3. Nervous
   4. Respiratory
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   Answer: Digestive

   The digestive system includes all organs that process food: mouth, esophagus, stomach, small intestine, large intestine, and supporting organs like the liver and pancreas.

5. Bones are part of the skeletal system and help protect organs like the brain and heart.

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   Answer: True

   The skull protects the brain, the ribcage protects the heart and lungs, and the vertebrae protect the spinal cord.

6. What gas do humans breathe IN that is needed by cells for energy?

   1. Carbon dioxide
   2. Nitrogen
   3. Oxygen
   4. Hydrogen
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   Answer: Oxygen

   Cells need oxygen to perform cellular respiration, which releases energy from glucose. CO2 is the waste product of that process.

7. Blood travels away from the heart in blood vessels called ___.

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   Answer: arteries

   Arteries carry blood away from the heart (usually oxygen-rich). A helpful memory trick: Arteries = Away.

8. The brain, spinal cord, and nerves make up the:

   1. Digestive system
   2. Skeletal system
   3. Circulatory system
   4. Nervous system
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   Answer: Nervous system

   The nervous system is the body's command and communication network, processing information and sending responses to all body parts.

9. The large intestine absorbs most of the nutrients from food.

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   Answer: False

   Most nutrient absorption occurs in the small intestine. The large intestine primarily absorbs water and compacts waste.

10. Which of these is NOT a function of the skeletal system?

    1. Support and structure
    2. Protect organs
    3. Produce blood cells
    4. Pump blood
    Show answer

    Answer: Pump blood

    Pumping blood is the job of the heart (circulatory system). Bones support the body, protect organs, and produce blood cells in their marrow.

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