Human Body Facts Quiz

Question 1

How many bones does an adult human body have?

Accepted Answer

206

Answer

186

Answer

216

Answer

256

Question 2

What is the largest organ in the human body?

Accepted Answer

The skin

Answer

The liver

Answer

The brain

Answer

The lungs

Question 3

How many chambers does the human heart have?

Accepted Answer

4

Answer

2

Answer

3

Answer

5

Question 4

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

Accepted Answer

100,000

Answer

50,000

Answer

200,000

Answer

500,000

Question 5

What is the hardest substance in the human body?

Accepted Answer

Tooth enamel

Answer

Bone

Answer

Cartilage

Answer

Nail keratin

Question 6

How much blood does an average adult human body contain?

Accepted Answer

4-5 litres

Answer

2-3 litres

Answer

5-6 litres

Answer

7-8 litres

Question 7

What is the longest bone in the human body?

Accepted Answer

The femur (thigh bone)

Answer

The spine (vertebral column)

Answer

The humerus (upper arm)

Answer

The tibia (shin bone)

Question 8

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

Accepted Answer

600

Answer

200

Answer

400

Answer

800

Question 9

What percentage of the human brain is water?

Accepted Answer

73%

Answer

40%

Answer

60%

Answer

90%

Question 10

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

Accepted Answer

About 86 billion

Answer

About 1 million

Answer

About 100 million

Answer

About 1 trillion

Question 11

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

Accepted Answer

2 million

Answer

100

Answer

10,000

Answer

200 million

Question 12

What is the smallest bone in the human body?

Accepted Answer

The stapes (stirrup) in the ear

Answer

The coccyx

Answer

The nasal bone

Answer

The sesamoid in the thumb

Question 13

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

Accepted Answer

O negative

Answer

A positive

Answer

AB positive

Answer

B negative

Question 14

How long is the human small intestine (approximately)?

Accepted Answer

6-7 metres

Answer

1-2 metres

Answer

3-5 metres

Answer

10 metres

Question 15

What is the function of the liver?

Accepted Answer

Filtering toxins, producing bile, and regulating metabolism

Answer

Pumping blood

Answer

Producing insulin

Answer

Filtering blood through the kidneys

Question 16

On average, how fast do fingernails grow per month?

Accepted Answer

2-3 mm

Answer

0.5 mm

Answer

5 mm

Answer

1 cm

Question 17

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

Accepted Answer

The brain

Answer

The heart

Answer

The muscles

Answer

The liver

Question 18

How many taste buds does the average human tongue have?

Accepted Answer

10,000

Answer

500-1,000

Answer

2,000-4,000

Answer

50,000

Question 19

What is 'DNA'?

Accepted Answer

Deoxyribonucleic Acid — the molecule carrying genetic information

Answer

Daily Nutritional Allowance

Answer

A type of protein in cells

Answer

A brain chemical that affects mood

Question 20

Approximately how many hairs does the average human head have?

Accepted Answer

80,000-120,000

Answer

10,000-50,000

Answer

200,000-250,000

Answer

500,000