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The Human Body
You carry the most complex object in the known universe around all day. Ten questions on how it works — each with a fact worth keeping.
About this topic
The most complicated thing you will ever study is the one you are sitting in. This quiz covers the human body from the outside in: the organs that keep you running, the systems that never switch off, and the small facts that surprise people about their own anatomy. The questions aim for genuine understanding rather than medical jargon, and every answer is explained in plain terms. It is the kind of knowledge that pays off in ordinary life, from making sense of a doctor's visit to simply appreciating the quiet, constant work your body does while you think about something else.
Questions & answers
The Human Body: all 10 questions and answers
Every question in this quiz is listed below with its correct answer and the reasoning behind it. Play first if you would rather not see the answers — or read through as a study sheet.
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1What is the largest organ of the human body?
- A The brain
- B The liver
- C The skin Correct
- D The lungs
Answer: C. The skin
Why: The skin is the body's largest organ, covering roughly two square metres in an adult and constantly renewing itself.
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2How many bones are in the adult human body?
- A 206 Correct
- B 150
- C 300
- D 260
Answer: A. 206
Why: Adults have 206 bones. Babies are born with around 300, many of which fuse together as they grow.
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3Which organ filters the blood and produces urine?
- A The kidneys Correct
- B The spleen
- C The pancreas
- D The liver
Answer: A. The kidneys
Why: The two kidneys filter about 180 litres of blood every day, removing waste and balancing fluids.
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4What in the blood carries oxygen around the body?
- A Haemoglobin Correct
- B Platelets
- C Plasma
- D White blood cells
Answer: A. Haemoglobin
Why: Haemoglobin inside red blood cells binds oxygen in the lungs and releases it to the tissues — and gives blood its red colour.
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5Where are the smallest bones in the human body found?
- A The toes
- B The fingers
- C The ear Correct
- D The nose
Answer: C. The ear
Why: The three tiniest bones — the malleus, incus and stapes — sit in the middle ear and pass sound vibrations inward.
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6Which part of the brain controls balance and coordination?
- A The cerebellum Correct
- B The cerebrum
- C The brainstem
- D The hippocampus
Answer: A. The cerebellum
Why: The cerebellum, at the back of the brain, fine-tunes movement and keeps you balanced.
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7What is the largest internal organ?
- A The liver Correct
- B The stomach
- C The lungs
- D The heart
Answer: A. The liver
Why: The liver is the largest internal organ and performs hundreds of jobs, from filtering toxins to storing energy.
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8How many chambers does the human heart have?
- A Four Correct
- B Five
- C Two
- D Three
Answer: A. Four
Why: The heart has four chambers — two atria and two ventricles — which keep oxygen-poor and oxygen-rich blood apart.
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9Which body system defends against infection?
- A The lymphatic system
- B The nervous system
- C The immune system Correct
- D The endocrine system
Answer: C. The immune system
Why: The immune system uses white blood cells and antibodies to recognise and destroy invading germs.
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10Roughly how many times does the heart beat in a day?
- A About 10,000
- B About 100,000 Correct
- C About 1 million
- D About 5,000
Answer: B. About 100,000
Why: A resting heart beats around 100,000 times a day, pumping the body's entire blood supply many times over.
Frequently asked questions about The Human Body
How many questions are in The Human Body?
The Human Body has 10 questions and takes about 6 minutes to finish. It is rated Easy and sits in our Science & Nature category.
How is The Human Body scored?
Each of the 10 correct answers adds 10 XP, up to 100 XP for a clean run. Wrong answers cost you nothing, and your full question-by-question review is shown at the end.
Are the answers to The Human Body explained?
Yes. All 10 questions carry a written explanation of why the correct answer is right, so the quiz works as a study sheet as well as a test.
Can I replay The Human Body?
Yes, as often as you like. The questions and the answer options are reshuffled on each run, and you can use Practice Mistakes afterwards to retry only the ones you missed. No account is needed to play.
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