so have you ever wondered how many atoms
there are in your body and why do your
veins look blue instead of red well
let's poke around the human body and see
what's going on
Goosebumps are an evolutionary reflex
left over from our ancestors the release
of adrenaline made their hair stand up
and they look scarier to approaching
Predators the beating sound Your Heart
Makes is the clap of valve leaflets
opening and closing
your heart doesn't replicate its cells
unless you have an injury
your corneas are the only parts of your
body that don't get blood they get
oxygen directly through the air
the human brain has 100 billion neurons
give or take
the vessels in your body are long enough
to circle the Earth twice or more
the idea that we use only 10 percent of
our brains is a myth at any given time
you use almost 100 percent otherwise you
wouldn't be able to perform simple tasks
like drink a cup of coffee when ancient
Romans Flex their biceps they thought
their muscles look like mice that's why
the word muscle translates as little
mouse in Latin your left lung is smaller
than the right one because it shares
space with your heart
experts used to think that we can only
distinguish ten thousand smells in fact
a recent study found human beings can
recognize one trillion smells
more than 70 percent of your brain
consists of water and it needs twenty
percent of your body's oxygen supply
found 700 different species of bacteria
in your mouth over six billion of them
live there
your skin is your largest organ it can
cover the surface area of two bath
towels
for every pound of fat you gain you
generate one mile of new blood vessels
to supply oxygen and nutrients to your
body
your stomach produces a new lining every
six days to avoid digesting itself
membranes blood vessels and muscles
surrounding your brain have pain
receptors but your brain doesn't that's
why you don't get brain aches
teeth are considered part of your
skeleton but they don't count as bones
nerve cells transmit one thousand nerve
impulses a second they travel at 1 to
268 miles per hour
our DNA contains 100 000 viruses
scientists have discovered one that goes
back 100 million years
if you type 60 words per minute for
eight hours a day it would take you 50
years to type the human genome
the biggest molecule in the human body
is the chromosome one a human cell has
23 chromosome pairs and each chromosome
one is made of 10 billion atoms
you inhale 25 sextillion molecules in
just one breath as 25 followed by 21
zeros if your caping score
you have a leaf-shaped flap at the top
of your larynx which shuts every time
you swallow to prevent food getting into
your lungs
the idea that the tongue has flavor
zones is a myth all taste buds can
detect five tastes but some receptors
are more responsive than others
the enamel of our teeth is the hardest
substance in the human body 96 percent
of it consists of minerals
humans get only two sets of teeth across
their whole lifetime but crocodiles
replace their teeth more than 45 times
your nose gets runnier when you have the
flu because it produces excess mucus to
get rid of microbes invading your body
your sense of smell is the only one that
goes directly to the part of the brain
that controls your emotions and memories
the bumps on your tongue aren't taste
buds they're mushroom-shaped bulbs each
of them has up to five taste buds with
100 taste receptor cells each
[Music]
your pancreas contains taste receptor
cells that allow it to detect not only
sugar but artificial sweeteners too it
uses the taste data to balance out
hormones
the most abundant element in the human
body is oxygen at 65 percent but it also
contains lithium Cobalt Gold and uranium
the rarest one of all is radium to give
you that glow I assume
you swallow 600 times a day once every
minute when you're awake and around
three times per hour while sleeping
human beings are the only animals that
willingly delay sleep so put your phone
away
the average person has 10 000 taste buds
but as they get older some taste cells
are not replaced an older person may
have just 5 000 working buds
you have 5 million hair follicles on
your body and only one hundred thousand
of them are on your head
hair grows half an inch every month so a
70 year old person that never got a
haircut would have hair as long as a
telephone pole
your eyes get their color from a pigment
called melanin brown eyed people have
more melanin than those with green eyes
which reminds me people with blue eyes
have completely colorless eye tissue
they get their color the same way water
and the sky get their shades of blue
the average lifespan of one eyebrow hair
is four months
body of a 110 pound person contains 40
tablespoons of salt
less than one percent of the population
is born with their hearts on the right
side of the chest instead of the left
you blink 15 to 20 times per minute and
your eyes have the fastest muscle group
in your entire body but when staring at
a computer screen your blink rate goes
down to five times a minute
the blood in your body travels four
miles per hour and it reaches your brain
in just a few seconds
you have around three million sweat
glands in your body many of them are on
the soles of your feet and on your palms
forehead armpits and cheeks
if you walked two miles per hour you'd
have to walk for 20 hours straight to
lose one pound
if you walk two miles per hour non-stop
it would take you 518 days and eight
hours to circle the equator
earwax isn't actually wax it contains
fat skin cells sweat and dirt aren't you
glad you asked oh you didn't
embryos develop fingerprints at three
months
sunburn is the result of radiation
exposure when your body's natural
defense mechanism gets overwhelmed
trying to fight UV rays a toxic reaction
occurs that results in sunburn
you get red eyes and photos because when
the camera flash goes off your pupils
don't have enough time to constrict a
large burst of Light reaches your retina
and it bounces back
the earliest known person to have had
blue eyes lived in the Stone Age seven
thousand years ago
contrary to popular belief contact
lenses can't get lost behind your eye
your teeth begin to form before you're
born but don't come out until you're six
to 12 months old
left-handed people usually prefer to
chew on the left side and right-handed
people well duh they chew on the other
side
even if your fingerprints are damaged
they'll go back in the same unique
pattern
there's a name for the growling sound my
stomach makes when I'm hungry it's
called borborygmus which I think is
Latin for hey dude can I get some food
over here
veins look blue because light has to go
through layers of skin and fat to reach
them your skin scatters a lot of the red
portion of white light before it
reflects the blood this leaves only the
blue light to bounce back to your eyes
a person who has amnosia is unable to
detect smells but fantosmia is when a
person smells an odor that isn't
actually there your fingernails grow
twice as fast as your toenails it would
take 15 and a half months for your
toenails to grow one inch but only seven
months for your fingernails to get this
long
layer of your skin is thicker on your
feet than other parts of your body the
heart has its own electrical system and
can continue beating even when it's
disconnected from the body we won't go
into how that can happen but trust me
when breathing a single lung only uses
five percent of the oxygen you've
inhaled your right kidney is probably
smaller and sits lower down than your
left kidney to make room for your lover
I mean liver
a 150 pound person's body is made up of
seven octillion atoms how many zeros
anyone Bueller Bueller yep 27.
it takes six to eight hours for food to
travel through your stomach and small
intestine that's because your body is
trying to absorb all its nutrients
food doesn't need gravity to get to your
stomach your muscles constrict and relax
to push it down kind of lik
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