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Can You Pass This Human Body Quiz? 33 Questions Everyone Should Know

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Can You Pass This Human Body Quiz? 33 Questions Everyone Should Know

About this quiz

Human body quiz: 33 questions about your bones, brain, heart, blood and senses that everyone should know. 🧠

What color is your blood really? When are you tallest? Which organ can grow back? A fast, family-friendly test of how well you know the body you live in. Great for family quiz nights, road trips and classrooms.

❓ IN THIS QUIZ

  • What color is your blood inside your body?
  • Which organ can grow back to full size even after most of it is removed?
  • Why does food taste bland when your nose is blocked?
  • When during the day are you tallest?

💬 How many did you get right? Tell us your score in the comments. Which body fact surprised you the most?

How to play

  1. Read the question and look at the pictures.
  2. Pick your answer before the timer runs out (or switch the timer off).
  3. See if you were right and read the fun fact.
Answers and fun facts (spoilers!)
  1. Let's start with a classic! What color is your blood inside your body?
    Always red
    Blood is always red! Veins only look blue because of how light passes through your skin.
  2. Which organ is about the size of your fist?
    Heart
    Your heart is roughly the size of your fist, and it grows as you grow!
  3. One part of your body gets its oxygen through your tears, not your blood. Which one?
    Cornea (eye)
    The cornea, the clear front of your eye, has no blood vessels. Oxygen dissolves in your tears and reaches it!
  4. How many chambers does the human heart have?
    4
    Your heart has 4 chambers: two at the top that collect blood, two at the bottom that pump it out.
  5. Which organs clean your blood and make pee?
    Kidneys
    Your two kidneys filter waste out of your blood and turn it into urine!
  6. Your two lungs are not the same size. Which one is smaller?
    Left lung
    Your left lung is smaller, to make room for your heart!
  7. How many baby teeth do children usually have?
    20
    Kids have 20 baby teeth. Adults usually have 32, including wisdom teeth.
  8. Which organ can grow back to full size even after most of it is removed?
    Liver
    As little as 25% of a liver can grow back into a whole liver!
  9. Where on your tongue can you taste sweet things?
    All over
    The famous 'tongue map' is a myth: every part of the tongue with taste buds can taste every flavor!
  10. About how many times does your heart beat in one day?
    About 100,000
    At 60 to 100 beats a minute, your heart beats around 100,000 times every day!
  11. How long does a red blood cell live?
    About 4 months
    Red blood cells live about 100 to 120 days, then your body recycles them.
  12. About how much of an adult's body is water?
    About 60%
    About 60% of an adult's body is water!
  13. What stops your stomach acid from digesting your stomach?
    A layer of mucus
    A thick coat of mucus protects your stomach lining from its own acid!
  14. What are your fingernails made of?
    Keratin
    Nails are made of keratin, the same tough protein as your hair!
  15. Which grow faster: fingernails or toenails?
    Fingernails
    Fingernails grow about 3.5 mm a month, roughly twice as fast as toenails!
  16. What is the colored part of your eye called?
    Iris
    No two irises have the same pattern, so they can be used like fingerprints!
  17. Hiccups are sudden jumps of which muscle?
    Diaphragm
    Hiccups are spasms of your diaphragm. The 'hic' sound is your throat snapping shut!
  18. What is normal human body temperature?
    37 °C (98.6 °F)
    Normal body temperature is about 37 °C (98.6 °F), though it changes a little through the day.
  19. Besides hearing, what else do your ears help you do?
    Balance
    Tiny fluid-filled tubes in your inner ear tell your brain which way is up!
  20. About how many times do you blink in a day?
    Over 10,000
    You blink about 17 times a minute, that's well over 10,000 times a day!
  21. What gives your skin its color?
    Melanin
    Melanin colors your skin, hair and eyes, and helps protect you from the sun.
  22. Your heart goes lub-dub. What makes that sound?
    Valves closing
    The 'lub-dub' is the sound of your heart valves snapping shut!
  23. What do your pupils do in the dark?
    Get bigger
    In the dark, your pupils get bigger to let in more light!
  24. What is the main job of white blood cells?
    Fight germs
    White blood cells are your body's defenders, hunting down germs!
  25. Which vitamin does your skin make in sunlight?
    Vitamin D
    Your skin makes vitamin D in sunlight, and it helps build strong bones!
  26. Your eyes see everything upside down! What flips the picture?
    Your brain
    The lens in your eye makes an upside-down image, and your brain flips it the right way up!
  27. What's the little flap that stops food going down your windpipe?
    Epiglottis
    Your epiglottis covers your windpipe every time you swallow!
  28. Where does digestion begin?
    Mouth
    Digestion starts in your mouth: chewing and saliva start breaking down food right away!
  29. Why does food taste bland when your nose is blocked?
    Smell makes flavor
    Much of what we call 'taste' is actually smell, so a blocked nose makes food taste bland!
  30. What is a burp mostly made of?
    Swallowed air
    Burps are mostly air you swallowed while eating, drinking or talking!
  31. What gives you goosebumps?
    Tiny hair muscles
    Tiny muscles pull each hair upright, a leftover from furry ancestors who puffed up to stay warm!
  32. Where exactly is your heart?
    Middle, tilted left
    Your heart sits in the middle of your chest, between your lungs, tilted a little to the left.
  33. Final question! When during the day are you tallest?
    In the morning
    You're about 1.5 cm (half an inch) taller in the morning: your spine squashes down a little during the day!