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Antibiotics: what are they and how do they work?
#10
(01-18-2012, 08:24 PM)ganesh Wrote: immune system is essential for our health explain?


Immune system is like a defense mechanism of our body, and is very essential for our survival. Human being has three line of defense mechanism. The foreign pathogen which if want to infect us has to cross or pass through our three line of defense. These are nature’s gift to us to protect our own life. The first line is non specific barriers like skin, mucosa, hairs etc., second line is white blood cells or leucocytes and third is the specific immune response which employs immunoglobulin’s or antibodies. Without this three line of defense man would have not been able to survive against the pathogens which are present around us in millions and billion numbers. Therefore immune system is essential for our health.

Immune system includes Bone marrow, thymus gland, lymphatic system, spleen, and many tissues. Our immunity has an ability to give response to antigens in two ways as recognition and response. In first phase immune system can distinguish foreign cell or proteins from body’s own cell or proteins; this is a unique property of our immune system. Once the foreign pathogen is recognized, effectors response kills or neutralizes the pathogen from its actions and protects body from infections. And in second phase it also keeps the memory for these pathogens, so in future if again it encounters, immune system can recognize and quickly kill it in very shorter time.

In modern world many vaccines have develop on this principle of recognitions and keeping the memory of the same for lifetime. Examples are virus vaccines like -Polio vaccines, hepatitis vaccines, influenza vaccines, measles vaccines, etc. and bacterial vaccines like Anthrax vaccines, tetanus, DPT vaccines, Typhoid vaccines etc. We have seen the impact of AIDS virus on our society which attacks our immune system.
So Immune system is very essential for our survival & adaptation during the course of evolution on the earth !
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RE: Antibiotics: what are they and how do they work? - by ExpertScie - 09-30-2012, 08:10 PM
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Antibiotics: what are they and how do they work?00