Human Body Systems Quiz

Grade 4 · Science · Quiz

Test your knowledge of the major systems that keep the human body working.

Questions

1. What is the job of the skeletal system?

   1. Break down food
   2. Pump blood
   3. Support and protect the body
   4. Bring in oxygen
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   Answer: Support and protect the body

   The skeletal system provides the body's framework, supports weight, protects organs (like the skull protecting the brain), and allows movement.

2. Which organ pumps blood through the body?

   1. Lungs
   2. Stomach
   3. Heart
   4. Liver
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   Answer: Heart

   The heart is the pump of the circulatory system, beating about 100,000 times a day to move blood throughout the body.

3. Where is most of the nutrient absorption in digestion?

   1. Mouth
   2. Stomach
   3. Small intestine
   4. Large intestine
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   Answer: Small intestine

   The small intestine is where most nutrients from digested food are absorbed into the bloodstream. It is about 20 feet long.

4. What does the respiratory system remove from the body?

   1. Oxygen
   2. Carbon dioxide
   3. Blood
   4. Nutrients
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   Answer: Carbon dioxide

   When your cells use oxygen, they produce carbon dioxide as a waste product. The respiratory system removes CO2 when you exhale.

5. Tendons connect muscles to bones.

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   Answer: True

   Tendons are strong cords of tissue that connect muscles to bones, allowing muscles to pull on bones and create movement.

6. Your heart is part of the respiratory system.

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   Answer: False

   The heart is part of the circulatory system, not the respiratory system. The respiratory system includes the lungs and airways.

7. The large intestine absorbs water from digested food.

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   Answer: True

   The large intestine absorbs water and some minerals from digested material, helping the body stay hydrated.

8. Blood travels from the heart through ___ to reach body tissues.

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   Answer: arteries

   Arteries carry oxygen-rich blood away from the heart to body tissues. Veins return blood to the heart.

9. The body system made up of bones is called the ___ system.

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   Answer: skeletal

   The skeletal system is the body system made up of bones, joints, and cartilage that provides the body's structural framework.

10. Which type of muscle is found only in the heart?

    1. Skeletal muscle
    2. Smooth muscle
    3. Cardiac muscle
    4. Voluntary muscle
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    Answer: Cardiac muscle

    Cardiac muscle is found only in the heart. It never tires and works continuously, beating about 100,000 times per day for your entire life.

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