Amazing Human Body Facts

25 Questions
Physiology Quizzes & Trivia

By Eddie Hung 2014

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Questions and Answers
  • 1. 
    How many bones in an adult human?
    • A. 

      68

    • B. 

      120

    • C. 

      206

    • D. 

      317

  • 2. 
    Which is the hardest structure in the human body?
    • A. 

      Enamel of the tooth

    • B. 

      Middle of long bone

    • C. 

      Pelvis

    • D. 

      Ear bones

  • 3. 
    Which is the smallest bone in the body?
    • A. 

      Last tail bone

    • B. 

      An ear bone called stapes

    • C. 

      The bone inside the nose

    • D. 

      The middle waist bone

  • 4. 
    How many bones in the hand?
    • A. 

      5

    • B. 

      13

    • C. 

      36

    • D. 

      54

  • 5. 
    How many times faster do the finger nails grow compared to that of toe nails?
    • A. 

      2

    • B. 

      4

    • C. 

      6

    • D. 

      8

  • 6. 
    How many cells are there in a human body?
    • A. 

      100 thousands

    • B. 

      100 billions

    • C. 

      100 trillions

    • D. 

      1000 trillion

  • 7. 
    How many cells are replaced every hour?
    • A. 

      1000

    • B. 

      10,000

    • C. 

      One million

    • D. 

      One billion

  • 8. 
    How much Oxygen is required by an adult human daily?
    • A. 

      900 gm

    • B. 

      8 Kg

    • C. 

      40 Kg

    • D. 

      120 Kg

  • 9. 
    What is the total length of all blood capillaries in a human body?
    • A. 

      56 km

    • B. 

      12,800 km (the diameter of the earth)

    • C. 

      100,000 km (2.5 times of the circumference of the arth)

    • D. 

      1 million km

  • 10. 
    What is the total surface area of all the air sacs (inside the lungs) in a human body?
    • A. 

      2.74 sq m (size of a table tennis table)

    • B. 

      436 sq m (size of a basketball court)

    • C. 

      18,000 sq m (size of a footy ground)

    • D. 

      70 sq m (size of a tennis court)

  • 11. 
    How much blood is filtered to form urine in a day?
    • A. 

      24 litres

    • B. 

      48 litres

    • C. 

      180 litres

    • D. 

      368 litres

  • 12. 
    How many cells do each square metre of skin have? 
    • A. 

      5500

    • B. 

      12,000

    • C. 

      3.5 millions

    • D. 

      6.8 millions

  • 13. 
    What is the length of the small intestine?
    • A. 

      3 m

    • B. 

      6 m

    • C. 

      10 m

    • D. 

      12 m

  • 14. 
    What is the total internal surface of the small intestine?
    • A. 

      6 sq m

    • B. 

      60 sq m

    • C. 

      600 sq m

    • D. 

      6000 sq m

  • 15. 
    How many bacteria can be found in our large intestine in percentage of dry mass of faeces?
    • A. 

      10%

    • B. 

      25%

    • C. 

      45%

    • D. 

      60%

  • 16. 
    What is the amount of saliva produced per day?
    • A. 

      35 ml

    • B. 

      500 ml

    • C. 

      1.7 litres

    • D. 

      2.9 litres

  • 17. 
    How many hairs do a person have?
    • A. 

      50,000

    • B. 

      100,000

    • C. 

      450,000

    • D. 

      1 million

  • 18. 
    Which organ performs the most number of functions?
    • A. 

      Lung

    • B. 

      Liver

    • C. 

      Thyroid gland

    • D. 

      Breast

  • 19. 
    Which is the largest organ in the body?
    • A. 

      Lung

    • B. 

      Small intestine

    • C. 

      Skin

    • D. 

      Diaphragm

  • 20. 
    How many facial muscles do you have?
    • A. 

      13

    • B. 

      25

    • C. 

      42

    • D. 

      53

  • 21. 
    How many brain cells in a person?
    • A. 

      1 billions

    • B. 

      10 billions

    • C. 

      100 billions

    • D. 

      1 trillions

  • 22. 
    How long will red blood cells live?
    • A. 

      56 days

    • B. 

      120 days

    • C. 

      2 years

    • D. 

      Forever

  • 23. 
    How many heartbeats do a person have in a year ?
    • A. 

      7200 times

    • B. 

      150,000 times

    • C. 

      1.5 millions

    • D. 

      35 millions

  • 24. 
    What is the percentage of the mass of the brain?
    • A. 

      2%

    • B. 

      12%

    • C. 

      22%

    • D. 

      32%

  • 25. 
    How much Oxygen is used by the brain?
    • A. 

      2%

    • B. 

      11%

    • C. 

      20%

    • D. 

      32%