How much blood passes through an adult heart each time it beats? (ml)

• 1

• 5

• 27

• 70

• 100

How long are all the blood vessels in the body if you put them all in a line? (km)

• 18,000

• 96,000

• 86,000,000,000

• 100

• 25

What percentage of the oxygen we breathe in do the lungs absorb? (%)

• 15

• 20

• 27

• 50

• 100

How many cells are in the human brain?

• 96,000

• 86,000,000,000

• 120,000,000,000

• 5,000,000,000

• 180,000,000,000

What percentage of the brain do we use?

• 25

• 50

• 73

• 90

• 100

What is the surface area of the skin of an adult male? (sense of touch) (cm²)

• 500

• 1500

• 9600

• 18000

• 19350

How many areas are there on the human tongue? (sense of tase)

• 1

• 2

• 3

• 4

• 5

What is the difference in your height if you measure how tall you are in the morning and again in the evening? (mm)

• 4

• 6

• 9

• 14

• 17

How many bones are there in an adult body?

• 187

• 200

• 206

• 212

• 226

What is the world record for the number of bones one person has broken?

• 120

• 249

• 358

• 435

• 678