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Question 1

What percentage of the human body is water?

Answer 1

The average human body contains about 60% water.

Question 2

How many neurons are in the human brain?

Answer 2

The human brain contains around 86 billion neurons.

Question 3

How strong are human bones compared to steel?

Answer 3

Human bones are about five times stronger than steel.

Question 4

How much blood does the heart pump daily?

Answer 4

The heart pumps about 2,000 gallons of blood every day.

Question 5

What is the largest organ in the human body?

Answer 5

The skin is the largest organ in the human body.

Question 6

How many bones do humans have in adulthood?

Answer 6

Humans have 206 bones in adulthood (babies have 270).

Question 7

What percentage of body weight does blood make up?

Answer 7

Blood makes up about 7-8% of a person’s body weight.

Question 8

How many colors can the human eye distinguish?

Answer 8

The human eye can distinguish about 10 million different colors.

Question 9

How many particles of skin do humans shed every hour?

Answer 9

Humans shed around 600,000 particles of skin every hour.

Question 10

At what speed can a human sneeze travel?

Answer 10

A human sneeze can travel at about 100 miles per hour.

Question 11

How many different scents can the human nose detect?

Answer 11

The human nose can detect over 1 trillion different scents.

Question 12

Which grows faster, fingernails or toenails?

Answer 12

Fingernails grow faster than toenails.

Question 13

How much iron does the human body contain?

Answer 13

The human body contains enough iron to make a 3-inch nail.

Question 14

Which part of the human body cannot repair itself?

Answer 14

Teeth are the only part of the human body that cannot repair themselves.

Question 15

What is the strongest muscle in the body relative to size?

Answer 15

The strongest muscle in the body, relative to size, is the tongue.

Question 16

How many permanent teeth do humans have?

Answer 16

Humans have 32 permanent teeth.

Question 17

How often does the human stomach produce a new layer of mucus?

Answer 17

The human stomach produces a new layer of mucus every two weeks to prevent self-digestion.

Question 18

How often do human bones regenerate?

Answer 18

Human bones constantly regenerate, so every 10 years, you have a brand new skeleton.

Question 19

Which side of the brain controls the opposite side of the body?

Answer 19

The left side of the brain controls the right side of the body and vice versa.

Question 20

How many cells are in the human body?

Answer 20

Your body contains about 37.2 trillion cells.

Question 21

Do human ears and noses stop growing?

Answer 21

Human ears and noses continue to grow throughout life.

Question 22

What is unique to every person?

Answer 22

Every person has a unique fingerprint.

Question 23

How many sweat glands does the average adult human have?

Answer 23

The average adult human has 2.5 million sweat glands.

Question 24

What is unique about humans regarding blushing?

Answer 24

Humans are the only species known to blush.

Question 25

How many hair follicles does the average human head have?

Answer 25

The average human head has about 100,000 hair follicles.

Question 26

How many hairs does the human body lose daily?

Answer 26

The human body loses about 50-100 hairs a day.

Question 27

How long is the human small intestine?

Answer 27

The human small intestine is about 22 feet long.

Question 28

How many muscles are in the human body?

Answer 28

There are over 600 muscles in the human body.

Question 29

What percentage of DNA do humans share with chimpanzees?

Answer 29

Humans share about 99% of their DNA with chimpanzees.

Question 30

How many breaths does the average human take per day?

Answer 30

The average human takes around 20,000 breaths per day.

Question 31

How much blood do humans have?

Answer 31

Humans have about 5 liters of blood.

Question 32

What is the fastest-growing tissue in the human body?

Answer 32

The fastest-growing tissue in the human body is hair.

Question 33

How many bones are babies born with?

Answer 33

Babies are born with 300 bones, but some fuse together over time.

Question 34

What is the relationship between smell and memory?

Answer 34

The sense of smell is closely linked with memory.

Question 35

Can the human liver regenerate?

Answer 35

The human liver can regenerate itself after damage.

Question 36

How much does the average person's skin weigh?

Answer 36

The average person’s skin weighs around 8-11 pounds.

Question 37

How many times does the heart beat in a day?

Answer 37

Your heart beats about 100,000 times a day.

Question 38

How many objects can the human eye focus on every second?

Answer 38

The human eye can focus on 50 different objects every second.

Question 39

What is the diameter of the aorta compared to?

Answer 39

The body’s largest artery, the aorta, is about the diameter of a garden hose.

Question 40

What percentage of the body's oxygen and calorie intake does the brain use?

Answer 40

The human brain uses 20% of the body's oxygen and calorie intake.

Question 41

What is unique about humans regarding emotional tears?

Answer 41

Humans are the only animals that cry emotional tears.

Question 42

How much saliva does the average person's mouth produce daily?

Answer 42

The average person’s mouth produces about 1 liter of saliva daily.

Question 43

How quiet of a sound can the human ear detect?

Answer 43

The human ear can detect sounds as quiet as 0 decibels.

Question 44

How often are taste buds replaced?

Answer 44

Your taste buds are replaced every 10 to 14 days.

Question 45

What percentage of body weight does the human skeleton account for?

Answer 45

The human skeleton accounts for about 14% of body weight.

Question 46

Does a person's height change throughout the day?

Answer 46

A person’s height changes throughout the day—taller in the morning, shorter by night.

Question 47

How long can humans survive without food and water?

Answer 47

Humans are capable of surviving without food for weeks, but without water, only for days.

Question 48

Can the human body survive extreme temperature variations?

Answer 48

The human body can survive extreme temperature variations.

Question 49

How many red blood cells does the body produce every second?

Answer 49

The body produces millions of red blood cells every second.

Question 50

How much of their lives do humans spend sleeping?

Answer 50

Humans spend about one-third of their lives sleeping.