Dazzled by the fascination of the materialistic life the modern man is busy only in the
discovery of the external objects of the world. But has perhaps no time or curiosity to
understand the structure of his own body. Is it not an irony of ironies that we are
completely ignorant of the structure of the body through the medium of which one
carries out all the activities of life, understands all things of life and carries on the
various researches. It is, therefore, necessary to know about its important organs. A
general knowledge of these organs will prove very useful for the practice of Yoga.
There are three parts of the body :
(1) The Physical Body
(2) The Astral Body
(3) The Causal Body
Discussion of the Astral and the Causal bodies will be found in the chapter on
“Pranayam”. Here we shall try to describe the structure of the Physical Body for
the benefit of the common man who should be familiar with the general
knowledge of the main organs of the human body.


Cells are those small units of the living organism that form the fundamental
basis in the making of the humans and other beings. They are not visible to the
naked eye, therefore, can be observed only by the microscope. In spite of being
different from one another they possess certain similarities, One will be surprised to
know that their number has been estimated to be 6000 billion. Cells perform different
functions. For example, tissue cells expand and contract. They are also present
under the layers of the skin. The brain cells are helpful in the thinking process. Eye
cells transmit rays to the brain. The beatings of the heart lead to the expansion of
the heart through the process of breathing. It is all the work of the cells. Not only this
they also provide energy in the blinking of the eyes, raising of the hands and such
other movements of the body organs. How many cells are built in a minute and
destroyed in the functioning of the body is difficult to speculate? In itself, it is altogether a
different world. In spite of their huge number, they work in complete union with one-
Functions: Primarily, the cells perform some important functions. Their main
function is to provide the raw material, convert it into the natural product and then
to work on the unused portion. The mainstream of life is so inextricably connected
with them that life continuous so long as the dead cells are replaced by the new


Different kinds of cells :

  1. Mitochondrion
  2. Ribosome
  3. Nucleus
  4. Vacuole
  5. Cytoplasm


A group of Cells is known as tissue which only performs one type of specific


When tissues perform collectively different functions of some particular part of
the body, which can be identified from other parts by its shape and qualities, that
particular part is called an organ, e.g. brain, liver, stomach etc.

Understanding a SYSTEM

When a group of many organs work together for a particular kind of function, it
is known as a System. There are nine such systems in our body.
As a result of the different Yoga practices, there is a lesser possibility of the
destruction of elimination of cells and a greater possibility of their formation. This is a
very important secret of the maintenance of one’s health and prolongation of youthful
The main systems to understand are

  • Nervous System
  • Glandular System
  • Digestive System
  • Excretion System
  • Respiratory System
  • Circular System

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