#Article 3
As promised in my previous article, in this article i will lead you through the science of body and the brain.
Human body like any other living body is made up of many small creature-like entities we call cells.
Cells are nothing but arrangement of atoms in a very complex manner such that there arise biological processeslike reproduction, growth, respiration, mobility, excretion and death.
It is interesting to note that this biological processes do not occour independently at sub-cellular levels.
Cells like stone or a brick are made up of atoms, but in cells, atoms themselves are organized into molecules and macro-molecules.
Although it is established scientific truth that polar charges in water and the positive and negative charges at each atoms of biomolecules determine the shape and therefore the functions of sub-cellular entities; and DNA dictates how each cell and it's constituents should be made, NO ONE EVER KNOWS WHY THERE IS LIFE AND LIFE PROCESSES.
There as around 13 billion cells in an adult human body and a hundred billion cells in brain.
There are single celled organisms, there is only one cell and that is a complete independent organism with all biological processes intact and functional.
There are different types of cells in human body, two most intriguing are epithelial cells - which make the outer lining of human body and nerve cells- the constituent of human brain.
In large organisms like human, these cells organize themselves into groups called tissues. These tissues work in harmony as if they were one entity.
There are numerous type of tissues in our body. Here we will look into epithelial tissues and nerve tissues.
You were told and agree that there are five different sense organs.
But what you have probably not known is all these five senses are made up of SAME TISSUES; A matrix of epithelial cells and nervous cells, with other tissues supporting them.
It is another mystery how the very cell that converts light into vision converts waves into sound or temperature into sensation, with very little difference.
Nerve cells are long and live long, often from birth to death. All other cells are short lived and are constantly replaced by new cells. One end of this nerve cells receive the external stimulus and convey the message to the brain as electrical impulses. Brain interprets these input relying solely on the repertoire of information already stored in it.
Although it is known that light gets converted to electrical signals on the surface of the retina in eye, but how different colours are differentiated and inferred from the homogenous electrical impulses is STILL A MYSTERY.
One stunning fact about your body is that the body you have now is 99.99% different from the body you had 5 years ago. All the cells you had then are dead and replaced by new ones, the body you have now is made up of those carbon atoms that were in animal dung, oxygen that is in your body was part of water in ocean or some sewage. And in next five years all the atoms you are made up of now will be disperesed, some will be constituents of animal body, other in air, some in ocean and other in soil.
So, what keeps you in the dark illusion?
Why are you not aware of all these changes happening in your own body?
Brain the mighty charrioter is made of some billion cells and a billion activities happening in each brain cells each second, each brain cell is connected to some million cells around it.
The output of these trillion complex electro chemical process form what is mind.
Ageing, the process of growing old, is related to the replacement of cells by new one when older cells die.
In #Article 4 we will look into the other functions of brain and the origin of mind from matter and origin of life and the myth of death.
Till then please follow 
