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The Human Body
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What is the aorta?
It's the longest artery. It's the first blood vessel the blood travels through once it leaves your heart, and carries the blood away to be distributed
Can the human body survive for longer without food, or without water?
Food. As a general rule, people can survive up to 3 weeks without food, but only 3 days without water
What is the most flexible muscle in the human body?
the tongue
True or false? The average human has 67 different species of bacteria living in their belly button.
True
True or false? The word “muscle” comes from a Latin term meaning “little mouse.”
True
What is the longest bone in the human body?
the femur
On average, how many times do you blink in a day?
 
28,800
 
48,800
 
68,800
 
88,800
On average, how many hairs are there on a person’s head?
 
100,000
 
200,000
 
50,000
 
250,000
What percentage of your body is water?
roughly 70%
How many bones are in the human feet?
 
52
 
26
 
38
 
18
True or false? Your body is made up of more human cells than bacteria cells.
False (for each human cell in your body there are about ten bacteria cells)
True or false? We lose 80% of our body heat from our heads.
True
True or false? Your tongue has different areas that more sensitive to different flavors.
False. This is a common myth taught in primary schools and it the result of a mistranslated scientific paper, from German to English.
How much salt does the average human body contain?
 
around 2650 grams
 
around 1650 grams
 
around 5650 grams
 
around 650 grams
Why does eyesight change as you get older?
The eye’s lens continues to grow throughout one’s life. It becomes thicker and less transparent.
Which is the rarest blood type in humans?
AB negative (less than one percent of the population has this blood type)
What is the longest type of cell in the body?
the nerve cell (neuron)
What's the lifespan of a human red blood cell?
around 120 days
Where are the three smallest bones in the human body? What are they called?
They are in the middle ear. Collectively called ossicles, the 3 bones are the malleus (hammer), incus (anvil) & stapes (stirrup).
True or false: Your body's temperature rises slightly during digestion.
True
In terms of attributed human deaths which are more dangerous; snakes, bees, sharks or house flies?
house flies
What is the hardest substance in the human body?
tooth enamel
If you go into space, do you get taller?
Yes, the cartilage disks in your spine expand due to the lack of gravity.
Can you lick your elbow?
No
True or false? Most of the dust in your home is made of human skin.
False
True or false? There are 206 bones in an adult human body and 300 bones in an infant's body.
True
Why does your foot fall asleep?
 
because you've temporarily squashed the nerves in your foot
 
because it's tired
 
because you've had too much to eat
 
because your heart has stopped pumping blood to that area
What is the most commonly broken bone in the human body?
 
the collarbone
 
the big toe
 
the leg
 
the pinky finger
True or false? If you're right-handed, the fingernails on your right hand grow faster.
True
Your body contains enough iron to make which household product?
 
a two-inch nail
 
a thumbtack
 
a teaspoon
 
a cast-iron pan
If your digestive tract were stretched out, how long would it be?
 
as long as two cars
 
as long as a banana
 
as long as a train
 
as long as a baseball bat
Your heart is the size of _____.
 
your fist
 
a marble
 
a walnut
 
a melon
What does mucus do?
 
It filters out harmful bacteria.
 
It helps you smell.
 
It helps your lungs take in oxygen.
 
It stops your nose from collapsing.
How many breaths does the average person take each day?
 
25,000
 
5,000
 
150
 
50
How many muscles do you use when you talk?
 
72
 
55
 
45
 
87
True or false? Your sense of smell is strongest in the morning.
False. It's strongest in the evening.
How fast does air rush out of your nose when you sneeze?
 
up to 160 kph
 
up to 16 kph
 
up to 80 kph
 
up to 200 kph
The most common eye color in the world is _____.
 
brown
 
blue
 
green
 
hazel
Without your cerebellum, you wouldn't be able to _____.
 
kick a soccer ball
 
remember what to get at the supermarket
 
blink your eyes
 
breathe
About how many hairs do most people lose every day?
 
75 strands
 
10 strands
 
35 strands
 
50 strands
How long does it take your body to completely digest your food? 
 
2 to five days
 
10 minutes
 
4 weeks
 
1 month
You use 43 of your face muscles to _____.
 
frown
 
laugh
 
smile
 
sip
Which liquid does your body produce over six cups of every day?
 
saliva
 
sweat
 
urine
 
stomach acid
The cerebellum and cerebral cortex are part of the _____.
brain
Which organ of the human body is the biggest?
the skin
Your tongue has around 10,000 _____.
taste buds
Your ears and nose are made of _____
 
cartilage
 
muscle
 
marrow
 
bone
How many teeth does a fully grown adult have?
32