The human body is divided into different physiological
systems, and the immune system is one of them. The word ‘immune’ is derived
from a Latin word ‘immunis’ which means ‘free’ or ‘untouched’. As the meaning
of this word suggests, the immune system is the defense mechanism of the body that
makes the body free of foreign invaders (pathogens) that can cause different
diseases.
The immune system is made up of a complex network of different
cells (white blood cells), proteins (antibodies) and organs.
Responsibilities of an immune system
A human body is always exposed to several, harmful foreign
elements -- like various organisms and viruses. Bacteria, parasites, fungi are
those living organisms that can induce diseases in the human body. Viruses are
also foreign invaders that are responsible for many diseases, but they are not
considered as living beings since they are not made up of living cells.
The immune system is responsible in fighting all these pathogens
that enter the body and cause diseases. Apart from that, the immune system also
neutralizes body cells that have malfunctioned due to different diseases.
How a healthy immune system helps in fighting diseases?
The immune system comprises two parts: the innate part and
the adaptive part. Innate immune system comprises white blood cells that ensure
general defense against pathogens. While the adaptive system works more
specifically to target pathogens with the help of specialized proteins called
antibodies. The adaptive immune system learns and adapts with time to fight
against a range of viruses and parasites.
Whenever the natural barrier of the human body is breached,
the first line of defense i.e. the innate immune system comes into play. The
phagocyte family of white blood cells, consists of dendritic cells, macrophages
, and granulocytes which are part of the innate immune system neutralizes those
bacteria, germs and foreign invaders by ingesting and engulfing harmful foreign
elements. These actions underline the working of the innate immune system.
If invading pathogens are more complex in nature or
outnumber the phagocytes, then innate immune system signals more specialized
cells to fight against them. These specialized cells are collectively known as lymphocytes
and they are part of the adaptive immune system.
Lymphocytes consist of T and B cells which are also known as
T and B lymphocytes. These are specialized cells that recognize pathogens by the
proteins that are attached to their surfaces called antigens. T cells are
responsible for various tasks; they kill infected cells, communicate with other
components of the immune system through cytokines and also help B cells to produce
antibodies. Antibodies are specialized proteins that bind to the antigens of
pathogens to mark them as dangerous cells which then help the immune system to
identify and destroy them.
When a healthy immune system is at work, we don’t even recognize
that they are fighting all the time to protect the physical and mental
wellbeing of the person. When an immune system doesn’t work efficiently, we encounter
diseases more often and become more vulnerable to viral diseases. In the worst
case scenario, the faulty immune system can result into autoimmune diseases.
Sources
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DR. JESSE A. STOFF is an internationally renowned physician with extensive credentials in clinical immunology and holistic medicine. A graduate of New York Medical College , he pursued extensive post-doctoral training including a fellow- ship at the Royal London Homeopathic Hospital in London , England . He has authored/co-authored countless articles and 8 books including co-authoring the bestseller "Chronic Fatigue Syndrome: The Hidden Epidemic" and The Prostate Miracle.
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