The Incredible Human Body

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The Incredible Human Body             
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   The Brain 
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It controls over 100 billion nerve cells and
generates more electrical impulses in a single
day than all of the world's telephones put
together moving at speeds from 150 to 250 miles
per hour.
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  At least 100,000 different chemical reactions
occur in the brain every second.
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The number of possible different combinations of
synaptic connections among neurons in a single
human brain is larger than the total number of
atomic particles that make up the known
universe. 
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It can store, recognize and remember 10,000
different odors and differentiate between up to
eight million colors and 500 shades of gray. 
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It is estimated that there are between 100 and
200 hundred billion neurons in a brain and seven
million brain cells are used each day.
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The brain reaches its maximum weight, three
pounds, at age 20 but begins to lose cells at a
rate of 50,000 per day by the age of 30. 
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The brain is composed of 85 water and on
average comprises 2 percent of the total body
weight, yet it requires 25 percent of all oxygen
used
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The short-term memory capacity for most people is
between five and nine items or digits. This is
one reason that phone numbers were kept to seven
digits. 
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A recent study found that 75 percent of headache
patients felt relief when they rubbed capsaicin
(the component that makes chili peppers hot) on
their nose. 
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A bowl of lime Jell-O, when hooked up to an EEG
machine, exhibits activity, which is virtually
identical to the brain waves of a healthy adult
man or woman.
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Thomas Edison said, "The chief function of the
body is to carry the brain around, however
Aristotle believed the main purpose of the human
brain was to cool the blood.
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Even after death, the human brain continues to
produce electrical wave signals for up to a day
and a half
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The Heart
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The heart of an adult beats about 70 to 80 beats
per minute, 100,000 times every day, 40 million
times a year and in 70 years it will have beaten
2½ billion times. 
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A female heart beats about 10 times per minute
faster than a males. 
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The rate can increase to as much as 200 per
minute during heavy exercise. As a pump it
produces enough pressure to shoot a stream 30
feet, produce enough energy in an hour to lift
2000 lb. 3 feet off the ground, and efficiently
circulate 50 million gallons over the average
lifetime.
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In one year, the average human heart circulates
from 770,000 to 1.6 million gallons of blood
through the body. This is enough fluid to fill
200 tank cars, each with a capacity of 8,000
gallons.
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There are enough tiny blood vessels called
capillaries that if placed end to end they would
stretch over 2 times around the earth. 
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All this is done with just over a gallon of blood
which circulates 1,000 times in a single day
through the body on a daily 60,000-mile journey,
168,000,000 miles in a lifetime.
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The human heart rests between beats. In an
average lifetime of 70 years, the total resting
time is estimated to be about 40 years.
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Men have more blood, 1.5 gallons as compared to
0.875 gallons for women.
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A child has 60,000 miles of blood vessels, in an
adult there are 100,000.
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The native people of the Andes Mountains in
South America have 2 to 3 more quarts of blood in
their bodies than people who live at lower
elevations.
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The Eyes
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As you focus on each word in this sentence, your
eyes swing back and forth 100 times a second, and
every second the retina performs 10 billion
computer-like calculations.
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Each time the eye blinks, over 200 muscles move
and you blink 25 times a minute or over 6 million
times each year. 
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The retina inside the eye covers about 650 square
millimeters
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An eye weighs 1.25 ounces. By the age of 60, our
eyes have been exposed to more light energy than
would be released by a nuclear blast.
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Your ears and nose continue to grow throughout
your entire life but your eyes are the same size
from birth to death.
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A bird's eye takes up about 50 percent of its
head human eyes take up about 5 percent of the
head. To be comparable to a bird's eyes, human
eyes would have to be the size of baseballs. 
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While 7 men in 100 have some form of
colorblindness, only 1 woman in 1,000 suffers
from it.
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People are the only animals in the world who cry
tears.
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Two out of three adults in the United Sates wear
glasses at some time.
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The Ears
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At 30 and 70, the ears may be a quarter-inch
longer due to the fact that cartilage is one of
the few tissues that continue to grow as we age.
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more
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The nose cleans, warms or cools, filters, and
humidifies over 500 cubic feet of air every day.
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A human can detect one drop of perfume diffused
throughout a three-room apartment.
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Most people by the age of sixty have lost 40
percent of their ability to smell.
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Your thumb is the same length as your nose.
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The average human has about 10,000 taste buds.
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The sense of taste can detect sweetness in a
solution of 1 part sugar to 200 parts water and
one gram of salt in 500 liters of water.
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The strongest muscle in the body is the tongue
and every person has a unique tongue print. 
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Each tooth contains about 55 miles of canals for
a total of over 1700 miles. 
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If you are right-handed, you will tend to chew
your food on the right side of the mouth. If you
are left-handed, you will tend to chew your food
on the left.
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A pack-a-day smoker will loose approximately 2
teeth every 10 years.
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It requires the use of 72 muscles to speak a
single word. 
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The mouth makes one liter of saliva a day and
over a lifetime produces enough to fill two
swimming pools. 
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Every time you lick a stamp, you're consuming
1/10 of a calorie. 
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Up to the age of six or seven months, a child
can breathe and swallow at the same time. An
adult cannot do this.