ShareYourGroupShareYourGroupGK

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.

Test yourself

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 Skin protects the body and helps to keep its temperature steady.
  3. Which is the longest and strongest bone in the body? Femur (thigh bone) The femur runs from the hip to the knee.
  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 The two upper chambers are called atria and the two lower ones ventricles.
  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 They are part of the body's immune system.
  8. Which blood group is called the universal donor? O negative In an emergency, O negative red cells can be given to patients of any blood group.
  9. Which blood group is called the universal recipient? AB positive A person with AB positive blood can receive red cells from all groups.
  10. What is the normal temperature of the human body? 37°C (98.6°F) It varies a little from person to person and through the day.
  11. Which organ pumps blood through the body? Heart The heart is about the size of a fist.
  12. Which organs filter waste from the blood and make urine? Kidneys We have two kidneys, shaped like beans, at the back of the abdomen.
  13. Which is the largest gland in the human body? Liver The liver makes bile, which helps to digest fats.
  14. Which gland produces insulin? Pancreas Insulin controls the level of sugar in the blood.
  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 Enamel is the outer covering of the teeth.
  17. Which vitamin does the body make with the help of sunlight? Vitamin D Vitamin D keeps bones strong. A lack of it can cause rickets in children.
  18. Lack of which vitamin causes night blindness? Vitamin A Carrots, green leafy vegetables and milk are sources of 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 Iron is needed to make haemoglobin, which carries oxygen in the blood.

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.

More topics

Daily quiz All topics