RizzQuizz

Human Body Records Quiz: Biggest, Smallest and Strongest Body Parts!

  • 🫀 Body & Health
  • 25 questions
  • Free · no sign-up

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Human Body Records Quiz: Biggest, Smallest and Strongest Body Parts!

About this quiz

Human body records quiz: 25 showdowns to find the biggest, smallest, longest and strongest parts of your body. 💪

The biggest organ, the tiniest bone, the longest muscle, the hardest substance: pick the record holder in each round and see how much you really know about yourself. Great for family quiz nights, road trips and classrooms.

❓ IN THIS QUIZ

  • What is the biggest organ in your body?
  • Where is the smallest bone in your body?
  • Which of these has no muscles inside it?
  • Which organ uses the most energy for its size?

💬 How many did you get right? Tell us your score in the comments. Which record was the hardest to guess?

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. What is the biggest organ in your body?
    Skin
    Your skin is your largest organ, covering about 1.5 to 2 square meters (16 to 22 sq ft)!
  2. Which is the heaviest organ inside your body?
    Liver
    Your liver is the heaviest internal organ, about 1.5 kg (3.3 lb)!
  3. Where is the smallest bone in your body?
    Ear
    The stapes, deep inside your ear, is the smallest bone in your body!
  4. Where is the smallest muscle in your body?
    Ear
    The stapedius in your ear is the smallest muscle in your body. It steadies the tiny stapes bone!
  5. Where is the longest muscle in your body?
    Thigh
    The sartorius runs from your hip across your thigh to your knee, the longest muscle in your body!
  6. Which is the single biggest muscle in your body?
    Bottom
    The gluteus maximus, your bottom muscle, is the single largest muscle in your body!
  7. What is the largest joint in your body?
    Knee
    Your knee is the largest joint in the human body!
  8. What is the hardest substance in your body?
    Tooth enamel
    Tooth enamel is the hardest substance in your body, harder than bone!
  9. Which of these has no muscles inside it?
    Fingers
    Fingers have no muscles! Muscles in your palm and forearm pull them with tendons, like puppet strings.
  10. What grows faster: the hair on your head or your fingernails?
    Hair
    Scalp hair grows about 1 cm a month, nearly three times faster than fingernails!
  11. About how many hairs are on a person's head?
    About 100,000
    Most people have around 90,000 to 150,000 hairs on their head. Blondes usually have the most!
  12. Which kind of cell can be the longest in your body?
    Nerve cell
    Some nerve cells stretch from your spine all the way down your leg, more than a meter long!
  13. Where is your longest and widest nerve?
    Leg
    The sciatic nerve runs from your lower back down each leg, the longest and widest nerve in your body!
  14. What is the biggest blood vessel in your body?
    Aorta
    Your aorta is the main pipe carrying blood out of your heart to the rest of your body!
  15. What are your smallest blood vessels called?
    Capillaries
    Capillaries are so thin that red blood cells squeeze through them in single file!
  16. What is the largest and strongest bone in your face?
    Jawbone
    Your jawbone, the mandible, is the largest and strongest bone in your face!
  17. About how much blood does an adult have?
    About 5 liters
    An adult has about 5 liters (1.3 gallons) of blood!
  18. How fast can the fastest nerve signals travel?
    430 km/h
    The fastest nerve signals travel about 120 meters per second, around 430 km/h (270 mph)!
  19. How much does an adult brain weigh?
    About 1.3 kg
    An adult brain weighs about 1.2 to 1.4 kg (around 3 lb).
  20. Where is the strongest tendon in your body?
    Heel
    The Achilles tendon at the back of your heel is the thickest and strongest tendon in your body!
  21. Which are your widest teeth?
    Molars
    Molars are your widest teeth, built for grinding food!
  22. Which weighs more: your heart or your brain?
    Brain
    Your brain weighs several times more than your heart!
  23. About how many muscles do you have?
    Over 600
    You have over 600 skeletal muscles working together!
  24. Which is the longest bone in your arm?
    Humerus
    The humerus runs from your shoulder to your elbow, the longest bone in your arm!
  25. Final question! Which organ uses the most energy for its size?
    Brain
    Your brain is only about 2% of your weight, but uses about a fifth of your body's energy!