Human Body Facts Quiz

1. How many bones does an adult human body have?

1. 186
2. 206
3. 216
4. 256

2. What is the largest organ in the human body?

1. The brain
2. The liver
3. The lungs
4. The skin

3. How many chambers does the human heart have?

1. 2
2. 3
3. 4
4. 5

4. Approximately how many times does the human heart beat per day?

1. 100,000
2. 200,000
3. 50,000
4. 500,000

5. What is the hardest substance in the human body?

1. Bone
2. Cartilage
3. Nail keratin
4. Tooth enamel

6. How much blood does an average adult human body contain?

1. 2-3 litres
2. 4-5 litres
3. 5-6 litres
4. 7-8 litres

7. What is the longest bone in the human body?

1. The femur (thigh bone)
2. The humerus (upper arm)
3. The spine (vertebral column)
4. The tibia (shin bone)

8. How many muscles are in the human body (approximately)?

1. 200
2. 400
3. 600
4. 800

9. What percentage of the human brain is water?

1. 40%
2. 60%
3. 73%
4. 90%

10. How many nerve cells (neurons) does the human brain contain?

1. About 1 million
2. About 1 trillion
3. About 100 million
4. About 86 billion

11. The human body makes about how many red blood cells per second?

1. 10,000
2. 100
3. 2 million
4. 200 million

12. What is the smallest bone in the human body?

1. The coccyx
2. The nasal bone
3. The sesamoid in the thumb
4. The stapes (stirrup) in the ear

13. Which blood type is known as the 'universal donor'?

1. A positive
2. AB positive
3. B negative
4. O negative

14. How long is the human small intestine (approximately)?

1. 1-2 metres
2. 10 metres
3. 3-5 metres
4. 6-7 metres

15. What is the function of the liver?

1. Filtering blood through the kidneys
2. Filtering toxins, producing bile, and regulating metabolism
3. Producing insulin
4. Pumping blood

16. On average, how fast do fingernails grow per month?

1. 0.5 mm
2. 1 cm
3. 2-3 mm
4. 5 mm

17. What is the body's most energy-hungry organ?

1. The brain
2. The heart
3. The liver
4. The muscles

18. How many taste buds does the average human tongue have?

1. 10,000
2. 2,000-4,000
3. 50,000
4. 500-1,000

19. What is 'DNA'?

1. A brain chemical that affects mood
2. A type of protein in cells
3. Daily Nutritional Allowance
4. Deoxyribonucleic Acid — the molecule carrying genetic information

20. Approximately how many hairs does the average human head have?

1. 10,000-50,000
2. 200,000-250,000
3. 500,000
4. 80,000-120,000