Easy Human Body Quiz Questions for Kids (with Answers)
Use this printable quiz list for classroom warm-ups, car trips, or revision. Tap any question to reveal the answer and a short explanation — then play the full human body quiz online with hints and stars.
Questions & answers
Tap a question to reveal the answer. 35 questions below.
1. How many bones are in the adult human body?Show answer
- 106
- 156
- 206 — correct
- 306
Adults have 206 bones — babies are born with around 270 which fuse together as they grow!
🦴 The smallest bone in your body is the stirrup bone in your ear — it is only 3mm long!
2. Which organ pumps blood around your body?Show answer
- Brain
- Lungs
- Heart — correct
- Liver
Your heart pumps blood to every part of your body delivering oxygen and nutrients!
❤️ Your heart beats about 100,000 times every single day — that is over 2 billion times in a lifetime!
3. What do we use to breathe?Show answer
- Kidneys
- Lungs — correct
- Stomach
- Liver
Your lungs take in oxygen when you breathe in and release carbon dioxide when you breathe out!
💨 If you spread out both lungs flat they would cover the size of a tennis court!
4. Which part of your body controls everything you do?Show answer
- Heart
- Stomach
- Brain — correct
- Spine
Your brain controls everything — thinking, moving, breathing, feeling and even sleeping!
🧠 Your brain uses about 20% of all the energy your body produces even though it only weighs about 1.4kg!
5. How many senses does the human body have?Show answer
- 3
- 4
- 5 — correct
- 6
The five main senses are sight, hearing, smell, taste and touch!
🧠 Scientists now think we might have up to 21 senses including balance, temperature and pain!
6. What is the largest organ in the human body?Show answer
- Brain
- Liver
- Skin — correct
- Intestines
Skin is the largest organ — it covers your entire body and protects everything inside!
🧴 You shed about 30,000 to 40,000 dead skin cells every hour — your outer skin renews itself every 2 to 4 weeks!
7. What liquid flows through your veins?Show answer
- Water
- Blood — correct
- Oxygen
- Milk
Blood carries oxygen and nutrients to every cell in your body and removes waste products!
🩸 Your body contains about 5 litres of blood — that is about the same as a large bottle of fizzy drink!
8. You use more muscles to frown than to smile.Show answer
Answer: True
Frowning uses about 43 muscles while smiling uses only about 17 — so smiling really is easier!
😊 Humans can make over 10,000 different facial expressions — more than any other animal!
9. What are your teeth made of?Show answer
- Bone
- Enamel — correct
- Calcium
- Ivory
The outer layer of your teeth is made of enamel — the hardest substance in the human body!
🦷 Unlike bones, tooth enamel cannot repair itself once damaged — that is why looking after your teeth is so important!
10. How many chambers does the human heart have?Show answer
- 2
- 3
- 4 — correct
- 6
The heart has 4 chambers: the left and right atria at the top and the left and right ventricles at the bottom!
❤️ The left side of your heart pumps blood to your whole body while the right side pumps blood only to your lungs!
11. Which organ helps you digest food?Show answer
- Heart
- Brain
- Stomach — correct
- Lungs
Your stomach uses acid and muscles to break down food into smaller pieces so your body can use it!
🍔 Your stomach produces a new lining every 3 to 4 days — otherwise its own acid would eat through it!
12. What is the longest bone in the human body?Show answer
- Spine
- Femur — correct
- Tibia
- Humerus
The femur or thigh bone is the longest and strongest bone in the body!
🦴 Your femur can support up to 30 times your body weight — it is incredibly strong!
13. Your hair and nails are made of the same material.Show answer
Answer: True
Both hair and nails are made of a protein called keratin — the same material as animal horns and claws!
💅 Fingernails grow about 3.5mm per month — toenails grow more slowly at about 1.5mm per month!
14. How many teeth do adult humans have?Show answer
- 24
- 28
- 32 — correct
- 36
Adults have 32 teeth including 4 wisdom teeth — though many people have their wisdom teeth removed!
🦷 Humans get two sets of teeth in their lifetime — 20 baby teeth and 32 adult teeth!
15. What do kidneys do?Show answer
- Pump blood
- Filter blood — correct
- Digest food
- Store energy
Your kidneys filter your blood removing waste and excess water which becomes urine!
💧 Your kidneys filter about 180 litres of blood every single day — that is like filtering a large bathtub full of blood!
16. Which body part protects your brain?Show answer
- Spine
- Skull — correct
- Ribcage
- Pelvis
Your skull is a hard protective case made of 22 bones that protects your brain!
💀 A baby's skull has soft spots called fontanelles that allow the brain to grow — they close up by age 2!
17. What is the coloured part of your eye called?Show answer
- Pupil
- Cornea
- Iris — correct
- Retina
The iris is the coloured ring around your pupil that gives your eyes their unique colour!
👁️ Your iris pattern is unique — like a fingerprint no two people have exactly the same iris pattern!
18. Humans are the only animals with fingerprints.Show answer
Answer: False
Chimpanzees, gorillas and even koalas have fingerprints — koala prints are so similar to humans they can confuse forensic scientists!
🐨 Koala fingerprints are so similar to human fingerprints that they have been mixed up at crime scenes!
19. How many muscles are in the human body?Show answer
- Over 100
- Over 300
- Over 600 — correct
- Over 900
The human body has over 600 muscles — from tiny ones that move your eyes to large ones that move your legs!
💪 The strongest muscle relative to its size is the masseter — the muscle in your jaw used for chewing!
20. What is the main job of red blood cells?Show answer
- Fight germs
- Carry oxygen — correct
- Digest food
- Store energy
Red blood cells carry oxygen from your lungs to every cell in your body!
🩸 Your body produces about 2 million new red blood cells every second — each one lives for about 120 days!
21. Which part of the body do you use to taste food?Show answer
- Teeth
- Tongue — correct
- Throat
- Nose
Your tongue has about 10,000 taste buds that can detect sweet, sour, salty, bitter and savoury flavours!
👅 Your tongue print is unique just like your fingerprints — no two tongues are identical!
22. Your brain is more active when you are asleep than when you watch TV.Show answer
Answer: True
During sleep your brain is very active — it processes memories, repairs cells and clears waste products!
🧠 During REM sleep your brain activity is almost identical to when you are awake — this is when you dream!
23. What protects your heart and lungs?Show answer
- The skull
- The spine
- The ribcage — correct
- The pelvis
Your ribcage is made of 24 ribs that form a protective cage around your heart and lungs!
🦴 Most people have 24 ribs but about 1 in 500 people are born with an extra rib called a cervical rib!
24. How long is the small intestine in an adult?Show answer
- About 1 metre
- About 3 metres
- About 6 metres — correct
- About 10 metres
The small intestine is about 6 metres long — it absorbs nutrients from digested food!
🌀 Despite being called small the small intestine is much longer than the large intestine — it is called small because it is narrower!
25. What do white blood cells do?Show answer
- Carry oxygen
- Digest food
- Fight germs — correct
- Store energy
White blood cells are your immune system soldiers — they identify and destroy bacteria, viruses and other threats!
🦠 White blood cells can move out of blood vessels into surrounding tissues to hunt down and destroy germs!
26. Which organ produces bile to help digest fats?Show answer
- Kidney
- Pancreas
- Liver — correct
- Spleen
Your liver produces bile which helps break down fats in your food — it also detoxifies your blood!
🫁 Your liver performs over 500 different functions — it is the most versatile organ in your body!
27. Humans are born with all the brain cells they will ever have.Show answer
Answer: False
Your brain can grow new neurons throughout your life — especially in areas related to memory and learning!
🧠 Exercise and learning new things help your brain grow new connections — reading, puzzles and physical activity are all great for your brain!
28. How many bones are in the human hand?Show answer
- 16
- 23
- 27 — correct
- 32
Each human hand contains 27 bones — that is over a quarter of all the bones in your whole body!
✋ Your hands and feet together contain more than half of all the bones in your body!
29. What is the name of the funny bone in your elbow?Show answer
- Ulnar nerve — correct
- Radial nerve
- Median nerve
- Femoral nerve
The funny bone is actually the ulnar nerve — hitting it causes a tingling sensation because it runs close to the skin!
😂 The funny bone gets its name from the humerus bone it runs alongside — humerus sounds like humorous!
30. How many litres of air do human lungs hold?Show answer
- About 2 litres
- About 4 litres
- About 6 litres — correct
- About 8 litres
Human lungs can hold about 6 litres of air when fully inflated — though we normally use much less!
💨 You breathe about 20,000 times per day taking in around 11,000 litres of air!
31. Your heart is about the same size as your fist.Show answer
Answer: True
Your heart is roughly the same size as your own fist — it weighs about 300 grams in an adult!
❤️ A child's heart is about the size of their fist too — it grows as your body grows!
32. Which part of the eye focuses light onto the retina?Show answer
- Iris
- Pupil
- Lens — correct
- Cornea
The lens focuses light onto the retina at the back of your eye — this is what allows you to see clearly!
👁️ Unlike camera lenses your eye lens is flexible — tiny muscles change its shape to focus on near and far objects!
33. What is the name of the substance that gives skin its colour?Show answer
- Keratin
- Melanin — correct
- Collagen
- Haemoglobin
Melanin is the pigment that gives skin, hair and eyes their colour — more melanin means darker colouring!
☀️ When you spend time in the sun your body produces more melanin to protect your skin — this is what causes a tan!
34. How fast does your heart beat per minute at rest?Show answer
- 30 to 40 times
- 60 to 100 times — correct
- 120 to 150 times
- 200 to 250 times
A healthy adult heart beats 60 to 100 times per minute at rest — that adds up to about 100,000 beats per day!
🏃 When you exercise your heart can beat over 200 times per minute to pump more blood to your muscles!
35. The human body is mostly made of water.Show answer
Answer: True
About 60% of the human body is water — it is found in blood, cells, organs and almost everywhere in your body!
💧 Your brain is about 75% water — even mild dehydration can affect how well you think and concentrate!
Easy Human Body Quiz Questions for Kids (with Answers)