Understanding The Immune System

Immune system is the foundation for good health.

Components of Immune System

Our immune system, made of a network of cells, tissues, and organs, work together to protect us when micro-organisms invade the body. The system can distinguish what belongs to the body from everything foreign to it, and  protect it against infections by foreign substances.

Let’s say a microorganism breaches one of your natural defenses (i.e., skin, mucosal surfaces, etc.), and you just received a cut on your finger. Your body now faces the risk of a full-scale invasion from bacteria or viruses. Let’s see how your body protects you from such a threat.

The cells at the site of injury have been destroyed by the cut and the body responds by dilating the blood vessels and increasing the blood flow. These cells also alert other cells of the immune system of the impending danger and promote migration of other cells.

This brings the immune system’s primary defensive immune cells – the white blood cells or leukocytes – to the damaged area in great numbers.

Leukocytes come in two basic types: phagocytes and lymphocytes. Phagocytes initiate search-and-destroy attack on invading organisms. Neutrophils are phagocytes which phagocytize foreign material. They contain granules filled with potent chemicals capable of destroying microorganisms.

Monocytes are phagocytes which circulate in the blood, then migrate into tissues where they develop into macrophages (”big eaters”). They find and “swallow” bacteria, viruses, and dead or injured body cells and throw worn-out cells and debris out of the body.  


Lymphocytes: Producing Antibodies Against Antigens

Foreign substances are capable of triggering an immune response in the body and are called antigens.

Antigens are proteins that may be contained within or on bacteria, viruses, other microorganisms, or cancer cells. Antigens may also exist independently—for example, as food molecules or pollen. Bacteria and viruses have antigens on their surface which are different from the body’s “self” antigens.

A normal immune response consists of recognizing the potentially harmful pathogenic antigens, activating and mobilizing forces to attack it.

Lymphocytes are one of the chief components of the immune system which is responsible for this. They are formed in lymphatic tissue throughout the body including the spleen, thymus, tonsils, and lymph nodes.

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19 Responses to “Understanding The Immune System”
  1. mdrkarim7 Says...

    On March 2, 2012 at 7:55 am

    Good share.

  2. Angelji Says...

    On March 2, 2012 at 10:25 am

    This is a good information hence we got a very exploited world..any time Viris is spread out attacking our immune system.

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  4. Lynn Hollis Says...

    On March 2, 2012 at 4:47 pm

    The human body is an amazing and complex creation. Thanks for explaining how the immune systems helps to keep us in good health.

  5. ittech Says...

    On March 2, 2012 at 9:44 pm

    Good to learn that! :)

  6. Nxwtypx Says...

    On March 2, 2012 at 10:32 pm

    The body is an awesome topic of study.

  7. Eunike Says...

    On March 2, 2012 at 11:12 pm

    Wonderful post

  8. girishpuri Says...

    On March 3, 2012 at 12:55 am

    This is good to know more about immune system and a good immune system is must for good health , thanks

  9. JMorgan071 Says...

    On March 3, 2012 at 6:14 am

    Another well written piece, nice one!

  10. Srikanth Radhakrishna Says...

    On March 3, 2012 at 11:12 am

    Well researched article

  11. erwinkennythomas Says...

    On March 3, 2012 at 5:19 pm

    great explanation

  12. PR Mace Says...

    On March 3, 2012 at 7:26 pm

    Well researched and informative.

  13. Melody SJAL Says...

    On March 3, 2012 at 11:41 pm

    very well-researched and well-explained.

  14. Hotnews Says...

    On March 8, 2012 at 2:15 pm

    Nice Articles..

  15. valli Says...

    On March 10, 2012 at 8:30 am

    A comprehensive guide about our immune system.

  16. swathipriya Says...

    On March 11, 2012 at 10:42 am

    Good article.

  17. papaleng Says...

    On March 14, 2012 at 3:45 am

    Excellent information that is so educating.

  18. FX777222999 Says...

    On March 15, 2012 at 4:34 pm

    Nice health subject matter.

  19. indianwriting Says...

    On March 23, 2012 at 1:17 am

    hey…this is a great article. took me all the way back to the biology classes.

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