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Human body: GK questions and answers

Your body is the most amazing machine you will ever own. These questions cover the facts about bones, blood, organs and vitamins that come up again and again in school science and in quizzes.

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Ten questions picked at random from this topic, four choices each. Or go through every question as flash cards.

20 questions on human body

  1. How many bones are there in an adult human body? 206 A baby is born with more bones, which join as it grows.
  2. Which is the largest organ of the human body? Skin
  3. Which is the longest and strongest bone in the body? Femur (thigh bone)
  4. Where is the smallest bone of the body found? In the ear It is called the stapes.
  5. How many chambers does the human heart have? Four
  6. Which blood cells carry oxygen? Red blood cells They contain haemoglobin, which gives blood its red colour.
  7. Which blood cells fight infection? White blood cells
  8. Which blood group is called the universal donor? O negative
  9. Which blood group is called the universal recipient? AB positive
  10. What is the normal temperature of the human body? 37°C (98.6°F)
  11. Which organ pumps blood through the body? Heart
  12. Which organs filter waste from the blood and make urine? Kidneys
  13. Which is the largest gland in the human body? Liver
  14. Which gland produces insulin? Pancreas
  15. How many teeth does an adult normally have? 32 Children have 20 milk teeth.
  16. Which is the hardest substance in the human body? Tooth enamel
  17. Which vitamin does the body make with the help of sunlight? Vitamin D
  18. Lack of which vitamin causes night blindness? Vitamin A
  19. Lack of which vitamin causes scurvy? Vitamin C Citrus fruits such as lemons and oranges are rich in it.
  20. Lack of which mineral commonly causes anaemia? Iron

These are well-established facts, written in our own words and last checked on 11 November 2026. If your textbook says something different, follow your textbook and tell us.

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