ScienceAges 12+15 questions

Human Body Quiz

Your body is the most complicated machine you will ever own. This quiz covers bones, organs, blood, the senses and the brain, starting with the basics and building up to facts that surprise most people.

Read the questions and answers here, or host the quiz live: show it on a big screen while everyone answers on their own phones, with points for speed and a podium at the end.

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The questions

  1. 1.How many chambers does the human heart have?

    • ATwo
    • BThree
    • CFour
    • DSix
    Show the answer

    Four. The heart has two atria at the top and two ventricles at the bottom.

  2. 2.Which gas does the body need to take in when we breathe?

    • AOxygen
    • BCarbon dioxide
    • CNitrogen
    • DHelium
    Show the answer

    Oxygen. Our cells use oxygen to release energy from food, and we breathe out carbon dioxide as waste.

  3. 3.Red blood cells carry oxygen around the body.

    True or false?

    Show the answer

    True. Red blood cells contain haemoglobin, a protein that picks up oxygen in the lungs.

  4. 4.How many bones does an adult human skeleton usually have?

    • A106
    • B206
    • C186
    • D306
    Show the answer

    206. Babies are born with around 300 bones, and some fuse together as they grow, leaving 206.

  5. 5.Which is the longest bone in the human body?

    • AThe femur (thigh bone)
    • BThe humerus (upper arm)
    • CThe tibia (shin bone)
    • DThe spine
    Show the answer

    The femur (thigh bone). The femur runs from the hip to the knee and is also one of the strongest bones.

  6. 6.Which is the largest organ of the human body?

    • AThe liver
    • BThe brain
    • CThe lungs
    • DThe skin
    Show the answer

    The skin. The skin covers the whole body and is the largest organ by both area and weight.

  7. 7.The blood in your veins is blue.

    True or false?

    Show the answer

    False. Blood is always red; blood low in oxygen is a darker red. Veins only look blue through the skin.

  8. 8.Which organs filter the blood to make urine?

    • AThe lungs
    • BThe kidneys
    • CThe stomach
    • DThe heart
    Show the answer

    The kidneys. The two kidneys filter waste and extra water out of the blood.

  9. 9.The smallest bone in the body, the stapes, is found where?

    • AIn the ear
    • BIn the nose
    • CIn the toe
    • DIn the finger
    Show the answer

    In the ear. The stapes is one of three tiny bones in the middle ear that pass sound vibrations inwards.

  10. 10.Which blood vessels carry blood away from the heart?

    • AVeins
    • BCapillaries
    • CArteries
    • DNerves
    Show the answer

    Arteries. Arteries carry blood away from the heart; veins bring it back.

  11. 11.Which part of the eye controls how much light gets in?

    • AThe retina
    • BThe lens
    • CThe cornea
    • DThe iris
    Show the answer

    The iris. The coloured iris is a ring of muscle that makes the pupil bigger or smaller.

  12. 12.What is the hardest substance in the human body?

    • ABone
    • BTooth enamel
    • CFingernail
    • DCartilage
    Show the answer

    Tooth enamel. Enamel, the outer layer of a tooth, is harder than bone.

  13. 13.Which organ makes the hormone insulin?

    • AThe liver
    • BThe kidneys
    • CThe pancreas
    • DThe spleen
    Show the answer

    The pancreas. The pancreas releases insulin, which helps control the amount of sugar in the blood.

  14. 14.Which vitamin does your skin make when sunlight falls on it?

    • AVitamin A
    • BVitamin B12
    • CVitamin C
    • DVitamin D
    Show the answer

    Vitamin D. Sunlight on the skin lets the body make vitamin D, which helps keep bones strong.

  15. 15.Which part of the brain mainly controls balance and coordination?

    • AThe cerebellum
    • BThe cerebrum
    • CThe brainstem
    • DThe hypothalamus
    Show the answer

    The cerebellum. The cerebellum, at the back of the brain, fine-tunes movement and keeps us balanced.

Play it live, everyone on their phones

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