The body is composed of 70 trillion cells.
That's 70 million million cells! 80% of your body is water.
The hand has more moving parts controlled
by more muscles than any other structure in the body.
Only 1% of human genes differ from those
More babies are born between 3 and 4am than
any other time of the day.
Your arm span usually equals your height.
There are 200 different types of cells in
The body is made up of around 100 trillion
The body is 70% water by weight.
Fat cells are liquid at body temperature.
There are 700 different enzymes in the body.
The oldest human lived to be over 120 years
You breathe enough air throughout your lifetime
to fill 10 million balloons.
The air from a sneeze travels at almost
Humans breathe 20 times per minute.
Only 1/5 of the air you breathe is oxygen.
One cigarette shortens your life by 14 minutes.
Yawning can be the result of a lack of oxygen.
The heart pumps 5 liters of blood through
the body at any one time.
4000 quarts of blood are pumped through
the heart daily.
The heart may pump up to 2.5 billion times
in an average lifetime.
The heart is extremely efficient. It converts
50% of its fuel directly into energy while an automobile engine
converts only 25% of its fuel directly into energy.
The heart is about the size of your fist.
An average heart rate for men is 70 to 72
beats per minute.
An average heart rate for women is 78 to
82 beats per minute.
An average heart beats over 100,000 times
While you're sleeping the heart completes
a workload approximately equal to carrying a 30-pound pack to
the top of the 102 story Empire State Building.
Blood outside the body clots in about 6
There are about 62,000 miles of blood vessels
in the body. That's equivalent to 2.5 times around the world.
Red blood cells reproduce at a rate of 8
million new cells per second.
The largest vein is the inferior vena cava,
draining the entire lower half of the body into the heart.
The aorta is the largest artery, over 1in.
in diameter, supplying every tissue of the body except for the
fingernails and cartilage.
It takes one full minute for a blood cell
to travel through the entire body.
Blushing is a way your body cools itself
by dilating small blood vessels near the skin.
Some capillaries are small enough to only
allow blood cells to travel single file.
The average body has 30 to 40 billion fat
You consume 30 tons of food throughout your
It takes 24 hours to completely digest food.
The digestive tube from your mouth to your
anus is 9 meters or 30 feet long.
The digestive system has a surface area
of 2000 square feet.
The surface area of the digestive system
is approximately equal to that of a single's tennis court!
The hardest material in the human body is
the white enamel on your teeth.
Your mouth makes 1.2 quarts of saliva daily.
Mammals have a growth factor in saliva making
the inner lining of their mouth the fastest healing tissue in
Enzymes in the mouth only digest starchy
Dental plaque begins to develop only six
hours after brushing.
The salivary glands pour 1 to 1/2 liters
of water into the digestive tract daily.
The average person eats 3 lbs. of food daily.
The stomach can stretch to 50 times its empty
The stomach can hold about 4.5 quarts of
Each minute about 1/2 million damaged lining
cells are replaced in the stomach.
Vomiting can empty the stomach along with
the first foot of intestines.
Water molecules in the gut can move at 1500
miles/hour due to peristalsis.
It takes 4 to 8 seconds for food to travel
to the stomach.
Most absorption occurs within the first
quarter of the small intestine.
The small intestine averages 21 feet long.
The large intestine averages 5 feet long.
The colon is home to 100 trillion bacteria.
Human feces are normally 1/4 dead intestinal
The body's bacteria could fill a soup
Fat accounts for about 80% of the energy
stored in the body.
When resting, about half the energy used
by the muscle, liver, and kidneys is derived from fat.
The bacteria as it naturally exists within
the lumen (or hollow space) of the digestive tract is perfectly
harmless and beneficial, helping the digestion and absorption
of food that otherwise couldn't be absorbed. However, if this
bacteria ever did enter the body and the blood, due to a ruptured
digestive organ, it could be extremely harmful and even lethal.
The kidneys filter 180 quarts of blood daily.
1/4 of all the blood is filters by the kidneys
The yellow color of urine is caused by bile.
The lumen (contents) of the digestive tract
is considered outside the body like the hole of a donut, since
it's continuous with the outside of the body. The lungs and
kidneys eliminate most of the waste products from inside the body.
The digestive tract is disqualified from this function, since
most contents of feces never technically enters the body.
Calories burn fastest when exercise occurs
within three hours of a meal.
The average heart rate for college male students
is 72 beats per minute, while highly trained athletes can have
a resting heart of 30 to 40 beats per minute!
Wild animals have a much lower heart rate
than domestic animals. So take Fido for a walk and give yourself
You need to burn 4000 calories to zap away
one pound of fat.
The liver is the only internal organ that
will completely regenerate itself if partly damaged. Up to 25%
can be removed and within a short period of time it will grow
back to its original size and shape.
Straight hair is round in cross section while
curly hair is flat.
The average head has 100,000 hairs each
living for about 2 to 4 years.
There are over 5 million hair follicles
on the body.
No hair exists on the lips, palms or soles
of the feet. 50 to 100 scalp hairs fall out daily.
You have all the muscle fibers you will ever
have at birth. Once damaged they can't be replaced.
Arnold Shwarzenaeger has just about as many
muscle fibers as you do. They're just thicker.
A single muscle cell of the sartorius muscle
in the thigh can be more than 12 inches long.
There are more than 600 voluntary muscles
in the body.
The strongest muscle of the body is the
masseter muscle used for chewing.
Your hand contains 20 different muscles.
If all your muscles could pull in one direction
you could create a force of 25 tons.
Muscles account of 40% of your body weight.
It takes 17 muscles in your face to smile,
but it takes a whopping 43 muscles to frown.
You take 5 million steps per year.
& the Brain
A nerve can send up to 1000 impulses per
The brain operates on the same amount of
electricity as a 10-watt light bulb (used for the light in your
The adult brain has 14 billion nerve cells
and weighs only 3 lbs.
The brain is 85% water.
The brain uses 25% of all the body's
The longest nerve is located in the leg and
extending from the large toe to the spinal cord.
The pineal gland located in the center of
the brain tells the body the time of day and season of the year.
Each half of the brain (left or right) controls
its opposite side of the body.
One square inch of skin on the back of your
hand has 12,000 nerve endings.
Goosebumps add an extra layer of insulation.
The body is more sensitive to pain late in
Intelligent people have more zinc and copper in
Carbohydrates account for only 1% of the
body's weight, but play a central role in the chemical reactions
that provide cells with energy.
Lipids, including fatty acids, are water
insoluble and make up 40% of the organic matter in the body and
15% of the bodies weight.
Cholesterol is a steroid because it is a
lipid with the steroid skeletal configuration of 4 interconnected
Proteins such as DNA are large molecular
Proteins account for 50% of the organic material
in the body and 17% of the body's weight.
The vestibular organ, located in your inner
ear, detects changes in the position of your head to a few hair
Eyes at birth are 2/3 their mature size.
One in 12 men is colored blind.
There are 6 million cones (color light receptors)
and 120 million rods (black and white receptors) in each eye.
Pupils are holes through which the dark
interior of the eye can be seen.
Blinking causes the eyes to be closed for
a total of one hour each day.
Tears enter tiny holes on the inside corner
of the eye, travel down the lachrymal duct and into the nose causing
you to sniffle when you cry, or to sniffle when cold wind causes
more lubrication of the eye.
You secrete 17 gallons of tears throughout
It is impossible to lick your elbow. Now that you
know it is almost impossible to resist trying.
Sex & Reproduction
On average, a single healthy ejaculation
consists of 5 milliliters (1 teaspoon) of semen, and contains
300,000,000 to 500,000,000 sperm.
Over 8 million (8,388,608) (2 to the 23rd
power) different combinations of maternal and paternal chromosomes
can result during the formation of gametes.
Over 69,949,000,000,000 different combinations
of chromosomes can result from fertilization.
Another word for breast is mamma or mammary gland.
Mammals is a classification for more than 15,000 species of vertebrates
(animals having a spine) including ourselves. Mammals are characterized
by being warm blooded, having hair, and females having breasts.
This amazing collection of animals is basically named after the
scientific word for breasts. Why didn't they name the classification
after hair? Because even male scientists are apparently fixated
The time it takes humans to have sex varies
from a few minutes to many minutes, while most other mammals have
sex within a few seconds.
Humans have sex year round as opposed to
most animals that have sex only during a breeding season.
Humans and dolphins are two of the only animals
that have sex for fun or pleasure. We can thank our anatomy for
this. The clitoris is an organ with the exclusive function to
give the woman pleasure during sex. The penis is longer and wider
compared to close animal relatives reflecting its ability to bring
pleasure to both partners.
Human sex serves functions in addition to
reproduction. Not only is it fun and pleasurable, but it serves
to bring two people emotionally closer, resulting in strong relationships
that benefit each partner as well as their offspring.
Most women enjoy sex when they are no longer
fertile. (after menopause)
Conception occurs more often in December
than any other month.
There are 206 distinct bones in the body.
You shrink 1/2 an inch during the day due
to compression of the spinal column.
The hipbone is composed of 6 smaller bones.
Your pelvis is composed of your hipbone
and the last fused vertebrae called your sacrum.
There are 230 joints in the body.
The femur is the longest bone in the body.
26 bones are in the foot.
22 fused bones makeup the skull that protects
One in 20 people has an extra rib.
Landing from a jump exerts half a ton of
force within your femur. This is enough force to shatter granite!
The design of the Eiffel tower is based
on the design of human bone.
skin is the largest organ of the body weighing in at 9 pounds.
Your skin has a surface area on average of
20 square feet.
The average head has 100,000 hairs each living
for about 2 to 4 years.
There are over 5 million hair follicles on
No hair exists on the lips, palms or soles
of the feet.
50 to 100 scalp hairs fall out daily.
There are more than 650 sweat glands in one
square inch of skin
Under normal conditions and strenuous exercise
you can secrete 2 pints of sweat per hour.
Under severe heat and stress adult males
can secrete 1 to 2 liters of sweat per hour.
The collagen strands, which give skin its
strength and structure, are stronger than steel wires of the same
Skin grafts, not taken from oneself, are
usually grown from the circumcised foreskins of babies. The cells
from a baby's foreskin can generate enough skin cells to cover
a football field.
Fingernails grow four times faster than
Fingerprints form 6 to 8 weeks before birth.
500 million dead skin cells fall off daily
due to ordinary wear and tear.
A single pea-sized bead of sweat can cool
about 1 quart of blood by 1 degree F.
Americans spend spend about 750 million
on antiperspirants and deodorants a year.
Eccrine sweat glands open directly to the
skin. You have from 2 to 5 million eccrine glands on your body.
Apocrine sweat glands open into a hair follicle
on your scalp, armpits, and external genitals, and are mostly
responsible for body odor since sweat from these glands collects
on hair where bacteria breaks it down releasing a foul odor.
Sweat is mainly water, salt and electrolytes.
Electrolytes are molecules that help regulate the body's fluids.
Mattresses were originally secured on bed frames
by ropes. To make a bed firmer the ropes were pulled tight. Hence
the phrase "goodnight, sleep tight".
According to the Guinness Book of World Records...
Most fingers and toes on one person:
14 fingers and 15 toes
Fewest toes on one person:
2 on each foot
Most arms and legs on one person:
4 arms and 3 legs
Some people are born with tails, the longest
ever reported was 1 foot in length. Today tails are removed at
Longest beard on a person: 17.5 feet
Longest mustache: 11 ft. 11 in.
The largest feet: size 29.5
longest nose: 7.5 inches
The oldest baby tooth removed from an adult
was 82 years and 364 days old
Heaviest brain: 5 lb. 1 oz. from a 30 year
Lightest brain: 1 lb. 8 oz. from a 46 year
Largest gall bladder: 23 lb. from a 69 year
The oldest woman to give birth was 63 years
old. Today hormonal treatments allow some women to give birth
well after menopause.
The loudest snorer produced a roar of 93
The longest dream recorded was 3hr. 8min.
A man had the longest continuous hiccuping
fit for 68 years.