🫀 Human body trivia for kids

Every answer checked 31 October 2026. Free, no sign-up, nothing to download.

How the body works, in three rounds: the biggest organ and the baby teeth for the little ones, the 206 bones and the heart's four chambers for the middle ones, alveoli, hemoglobin and the cochlea for the big ones. Every answer was checked against KidsHealth or the National Institutes of Health.

🐣 Little round: ages 6–8 (grades K–2)

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1.Which part of your eye has the color, like blue or brown?
- A the iris
- B the pupil
- C the eyelash
2.How does a sloth spend most of its life?
- A running on the ground
- B digging tunnels
- C hanging upside down
3.How many baby teeth does a child have in all?
- A 20
- B 50
- C 10
4.What shape is the dark middle of a goat's eye?
- A a star
- B a rectangle
- C a circle
5.What is the biggest organ of your body?
- A the heart
- B the skin
- C the brain
6.What hard parts inside you hold your body up and give it shape?
- A veins
- B bones
- C muscles
7.Which part of your body pumps blood all around you?
- A the heart
- B the lungs
- C the stomach
8.Your nose helps you smell. Which other sense does it help a lot?
- A hearing
- B taste
- C sight
9.Which thin part inside your ear shakes when sounds reach it?
- A the earwax
- B the earlobe
- C the eardrum
10.Which part of your body do you use to think and remember?
- A the stomach
- B the brain
- C the heart

🔑 Show the answers

A: the iris. The iris also controls how much light gets into your eye. Source: NIH National Eye Institute
C: hanging upside down. Sloths even eat and sleep while hanging from tree branches. Source: Smithsonian's National Zoo
A: 20. Grown-ups get 32 teeth, which is 12 more than the baby set. Source: KidsHealth (Nemours)
B: a rectangle. That dark middle part of the eye is called the pupil. Source: Smithsonian's National Zoo
B: the skin. Your skin is always making new cells to take the place of old ones. Source: KidsHealth (Nemours)
B: bones. Your ribs are bones that keep your heart and lungs safe. Source: KidsHealth (Nemours)
A: the heart. Your heart is about as big as your fist. Source: NIH National Heart, Lung, and Blood Institute
B: taste. Smells from your food help you taste it more fully. Source: KidsHealth (Nemours)
C: the eardrum. It passes the shaking on to three tiny bones inside your ear. Source: NIH National Institute on Deafness and Other Communication Disorders
B: the brain. The biggest part of the brain, the cerebrum, does your thinking. Source: KidsHealth (Nemours)

🦊 Middle round: ages 9–11 (grades 3–5)

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1.Where in your body is your smallest bone?
- A in the ear
- B in the nose
- C in the little toe
2.How far away can a male wild turkey's gobble be heard?
- A up to 10 feet
- B up to one mile
- C up to 100 miles
3.How many chambers, or rooms, does the human heart have?
- A six
- B four
- C two
4.Besides hearing prey under the sand, what do a fennec fox's giant ears help it do?
- A stay cool
- B dig burrows
- C stay warm
5.About how many taste buds is a person born with?
- A about 1 million
- B about 10,000
- C about 100
6.About how many muscles are in your body?
- A fewer than 60
- B more than 600
- C fewer than 200
7.What happens to the pupils of your eyes in bright light?
- A they get smaller
- B they get bigger
- C they change color
8.Which wide teeth at the back of your mouth grind up food?
- A the canines
- B the molars
- C the incisors
9.How many bones does a grown-up's body have?
- A 406
- B 206
- C 106
10.Which waste gas do your lungs breathe out?
- A carbon dioxide
- B oxygen
- C helium

🔑 Show the answers

A: in the ear. It is called the stapes, or stirrup, and it helps you hear. Source: KidsHealth (Nemours)
B: up to one mile. Wild turkeys can fly up to 54 miles per hour, though only for short trips. Source: Smithsonian's National Zoo
B: four. The top two are the atria and the bottom two are the ventricles. Source: KidsHealth (Nemours)
A: stay cool. For its body size, the fennec fox has the biggest ears of any kind of dog or fox. Source: Smithsonian's National Zoo
B: about 10,000. Taste buds sit in the little bumps on top of your tongue, called papillae. Source: KidsHealth (Nemours)
B: more than 600. Muscles do jobs from pumping blood to lifting a heavy backpack. Source: KidsHealth (Nemours)
A: they get smaller. The pupil is really an opening that lets light into your eye. Source: KidsHealth (Nemours)
B: the molars. Your tongue pushes chewed food back to the molars to be mashed. Source: KidsHealth (Nemours)
B: 206. A baby starts with about 300 bones, and some of them grow together. Source: KidsHealth (Nemours)
A: carbon dioxide. Your lungs take oxygen into your blood and let carbon dioxide out. Source: NIH National Heart, Lung, and Blood Institute

🦉 Big round: ages 12 and up (grades 6 and up)

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1.In the retina, which cells sense color?
- A hair cells
- B rods
- C cones
2.Cattle digest plants using a four-compartment stomach. What group of animals does that make them?
- A marsupials
- B ruminants
- C rodents
3.What tough cords hold skeletal muscles to bones?
- A capillaries
- B tendons
- C ligaments
4.What grows in grooves on a two-toed sloth's hairs and can turn its fur green?
- A mold
- B algae
- C moss
5.What are the lowest two pairs of ribs, not joined to the breastbone in front, called?
- A floating ribs
- B sliding ribs
- C hanging ribs
6.What is the snail-shaped, fluid-filled part of the inner ear called?
- A the cochlea
- B the cornea
- C the larynx
7.Which protein in red blood cells carries oxygen?
- A keratin
- B insulin
- C hemoglobin
8.What are the tiny air sacs in the lungs where oxygen and carbon dioxide swap?
- A villi
- B alveoli
- C bronchi
9.Which part of the brain, at the back below the cerebrum, helps you keep your balance?
- A the cerebellum
- B the pituitary gland
- C the hypothalamus
10.What is the outer layer of your skin called?
- A the cortex
- B the dermis
- C the epidermis

🔑 Show the answers

C: cones. Each eye has about 120 million rods, which see in black, white and gray. Source: KidsHealth (Nemours)
B: ruminants. Their complex stomach turns tough plants into energy and building blocks for the body. Source: Smithsonian's National Zoo
B: tendons. When a muscle pulls, its tendon and the bone move along with it. Source: KidsHealth (Nemours)
B: algae. The grooves run from the top to the bottom of each brownish-gray hair. Source: Smithsonian's National Zoo
A: floating ribs. They can't float away: like all ribs, they are fixed to the spine in back. Source: KidsHealth (Nemours)
A: the cochlea. Tiny hair cells inside it help turn sound into electrical signals for the brain. Source: NIH National Institute on Deafness and Other Communication Disorders
C: hemoglobin. Blood turns bright red when hemoglobin picks up oxygen in the lungs. Source: KidsHealth (Nemours)
B: alveoli. Each person has hundreds of millions of alveoli in their lungs. Source: KidsHealth (Nemours)
A: the cerebellum. It is much smaller than the cerebrum but lets you stand up and move around. Source: KidsHealth (Nemours)
C: the epidermis. Below it is the dermis, which holds nerve endings, blood vessels and sweat glands. Source: KidsHealth (Nemours)

For the host

Every question here is about how the body works, never about being ill. Good for a class just before a science lesson.

Read each question and its three answers aloud, or press ▶ Play and Peabody reads them; a tap shows the answer, a line about it and where it comes from.
On a phone, pass it round: one question per team, a star for each right answer. On a laptop or a TV, press 📺 Big screen.
On paper, print the cards, one answer sheet per team and the key on its own page.

Where these questions come from

Each question was written by Peabody in its own words and checked against one page, named under its answer. The pages we used for these rounds:

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