Human Body GK Questions for Kids (with Answers)
The most amazing machine a child will ever know is their own body. These 30 human body GK questions cover the main organs, bones and muscles, the five senses, teeth, blood and the healthy habits that keep it all working.
30 questions · answers included · free to print and share
Easy human body GK questions (ages 5–7)
1.Which organ pumps blood around your body?
- Heart
- Lungs
- Brain
- Stomach
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Answer: Heart
Your heart is about the size of your own fist.
2.How many senses do we usually talk about?
- Three
- Five
- Seven
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Answer: Five
The five senses are sight, hearing, smell, taste and touch.
3.Which organs do we use to breathe?
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Answer: Lungs
When you breathe in, your lungs pass oxygen from the air into your blood.
4.Which organ helps us think and remember?
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Answer: Brain
Your brain also controls your breathing and heartbeat, even while you sleep.
5.Which sense organ helps us smell?
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Answer: Nose
Smell also helps you taste, which is why food can seem dull when you have a cold.
6.How many times a day should we brush our teeth?
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Answer: Twice
Brushing in the morning and before bed helps keep germs and tooth decay away.
7.What are a child’s first set of teeth called?
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Answer: Milk teeth
Children have 20 milk teeth, which fall out to make space for adult teeth.
8.Which part of the body protects the brain?
- Skull
- Ribs
- Spine
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Answer: Skull
The skull is made of many bones that fit together tightly as we grow.
9.Which part of the body do we use to taste food?
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Answer: Tongue
Your tongue is covered with thousands of tiny taste buds.
10.Why should we wash our hands before eating?
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Answer: To wash away germs
Washing with soap for at least 20 seconds removes far more germs than water alone.
Medium human body GK questions (ages 8–10)
11.How many bones does an adult human have?
- 106
- 206
- 306
- 360
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Answer: 206
Babies are born with nearly 300 bones, and some of them join together as they grow.
12.What is the largest organ of the human body?
- Liver
- Skin
- Heart
- Lungs
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Answer: Skin
Skin protects your body from germs and helps keep your temperature steady.
13.How many teeth does an adult usually have?
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Answer: 32
The last four, called wisdom teeth, often appear only between the ages of about 17 and 25.
14.What is the longest bone in the human body?
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Answer: Femur (thigh bone)
The femur is also the strongest bone in the body.
15.Which blood cells carry oxygen around the body?
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Answer: Red blood cells
Red blood cells get their colour from a substance called haemoglobin.
16.Which blood cells fight germs?
- Red blood cells
- White blood cells
- Platelets
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Answer: White blood cells
When you are ill, your body makes more white blood cells to fight the infection.
17.How many chambers does the human heart have?
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Answer: Four
The two upper chambers are called atria, and the two lower ones are called ventricles.
18.Which organs clean the blood and make urine?
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Answer: Kidneys
Most people have two kidneys, and each is about the size of a fist.
19.Which vitamin does our body make when sunlight falls on our skin?
- Vitamin A
- Vitamin C
- Vitamin D
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Answer: Vitamin D
Vitamin D helps the body use calcium to build strong bones and teeth.
20.What is the coloured part of the eye called?
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Answer: Iris
The black dot in the middle, the pupil, gets bigger in the dark to let in more light.
21.What joins muscles to bones?
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Answer: Tendons
The Achilles tendon, at the back of your heel, is the strongest tendon in the body.
22.About how many hours of sleep do children aged 6 to 12 need each night?
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Answer: About 9 to 12 hours
While you sleep, your body grows and repairs itself, and your brain stores what you learnt.
Hard human body GK questions (ages 11–13)
23.What is the smallest bone in the human body?
- Stapes
- Femur
- Kneecap
- Collarbone
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Answer: Stapes
The stapes, or stirrup bone, is in the ear, is about 3 mm long and helps carry sound.
24.What is the hardest substance in the human body?
- Bone
- Tooth enamel
- Nails
- Hair
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Answer: Tooth enamel
Enamel covers the outside of your teeth, but it cannot grow back, so it is worth protecting.
25.What is the largest organ inside the human body?
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Answer: Liver
The liver does hundreds of jobs, such as storing energy and removing harmful things from the blood.
26.How many pairs of ribs do humans usually have?
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Answer: 12 pairs
Your ribs form a cage that protects your heart and lungs.
27.What is the dome-shaped muscle below the lungs that helps us breathe?
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Answer: Diaphragm
Hiccups happen when the diaphragm suddenly tightens on its own.
28.Which body system is made up of the brain, the spinal cord and the nerves?
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Answer: Nervous system
Messages race along your nerves so quickly that you can pull your hand away from something hot in a split second.
29.What are the four main blood groups?
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Answer: A, B, AB and O
Each group can also be Rh positive or Rh negative, such as O positive or AB negative.
30.About how long is the small intestine of an adult?
- About 1 metre
- About 6 metres
- About 20 metres
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Answer: About 6 metres
It is called “small” because it is narrow, not because it is short.
Keep learning human body
The questions go from easy (ages 5–7) to medium (ages 8–10) to hard (ages 11–13), and each answer has a short fun fact. They are a gentle way to talk about brushing, sleep and hand-washing without a lecture.
How to use these questions at home
- Make it physical: point to each body part as you ask about it, and let younger children point on themselves.
- Link the healthy-habit questions to real routines, such as brushing time, hand-washing before meals and a fixed bedtime.
- Use a simple body outline drawing and let your child label each organ as they get the answers right.