FACTS ABOUT THE HUMAN BODY
The human body is an exceptional machine. It is made up of head, chest, two arms and two legs. By the
virtue of these, a person is able to think, stand straight, walk, lift and carry weights. When it comes
in deeper and more scientific terms, the human body consists of a brain which is known as the control
the processing unit of the body, a heart that pumps blood to every organ, a digestive system that fuels
the body with food and water and keeps it running smoothly, lungs which provide the necessary
amount of oxygen to every organ in the body and skin that acts as a protective layer for all these
internal organs. All this is well known by every individual but what is rather interesting about our
body are the less known, weird but intriguing facts about the human body that can make anyone think twice about the kind of things that occur inside this miraculous structure of bones.
I. A human being’s DNA would stretch 10 billion miles, from Earth to Pluto and back if it were
The genetic code in each human cell contains 23 DNA molecules each of which contains 5 to 25 lakh
nucleotide pairs. DNA molecules of this size are 5 cm long on average when uncoiled. The human body
has 10 trillion cells therefore if the DNA in all the cells is stretched end to end, it would stretch over
2,678 million km. This distance is lesser than the diameter of the solar system by some amount
which is equal to the round trip distance from Earth to Pluto.
II. A human skeleton renews itself completely every 10 years.
A human body replaces itself every 7 years at the cellular level but it takes 10 years for a body to get
total frame regeneration. However, this may not sound too surprising because cells die and get
replaced with new ones all the time but what matters is that the human body comprises of trillions
of cells and the time period until all the cells are completely reformed.
III. An average human adult is made up of 7,000,000,000,000,000,000,000,000,000 (7 octillion)
An average human being weighing 70 kg is made up of a number of atoms that is almost too big to
write. The body is mostly made up of hydrogen, oxygen, and carbon including some other trace
elements which on the whole constitute up to 7 x atoms.
IV. Some people can hear their eyeballs moving around in their head.
This actually comes under the category of hearing impairment. The middle ear converts sound
waves that vibrate the eardrum into mechanical vibrations for the cochlea, the hearing part of the
inner ear. People can hear this sound when some part of the bone protecting the superior
semicircular canal is missing.
V. Human beings spend about 5 years of their lives eating.
It is a calculated fact that an average human spends 5 years of his life eating.
VI. A human’s little finger contributes over 50% of the hand’s strength.
It seems hard to believe that the pinkie contributes to half of the hand’s total strength but it is true
that a person would lose his gripping power without his little finger. The thumb, index and the
middle finger only help in pinching and grabbing whereas the little finger combines with the ring
finger to provide gripping strength.
VII. In an adult human, blood circulates about 19,000 km a day which is like traveling from east to
west across the widest part of the Pacific Ocean.
The human body has about 5.6 L of blood circulating through the body three times every minute. In
one day, the blood travels a total of 19,000 km which is roughly four times the distance across the
U.S. from coast to coast.
VIII. A human eye can distinguish between 10 million different colors.
A normal human eye can see a variety of colors in 8-10 million range. In actual, the human eye can
distinguish between only 3 colors i.e. red, green and blue. It is either the combination or saturation levels of these colors than an eye sees.
IX. A person takes about 23,040 breaths a day or about 672,768,000 breaths in a lifetime.
An average person takes between 17,280 and 23,040 breaths a day.
X. Adult humans spend about 33% of their lives asleep.
If the average night sleep is eight hours (i.e. one-third of a day), one sleeps for one-third of one’s
life. An average human being who lives for 75 years, he’ll spend 25 years or 9,125 days of his life