The Role of the Circulatory System in Body Defense
Published by Diseases are caused by the presence of bacteria or viruses in the body. The symptoms may be due to the antigen or foreign proteins of the bacteria or the toxic chemicals produced by the bacteria. Recovery from the disease followed by immunity depends mainly on the production of antibodies in the blood. Antibodies are proteins released into the blood which destroy kills or rids the body of these disease causing microorganisms different ways..
Various types of diseases causing microorganisms are ever present in our environment. We are exposed to all types the body and cause various types of diseases. Therefore we do need defense mechanism for our body. The blood circulating systems as well as the lymphatic system play a very important role in the body defense mechanism.
These pathogenic microorganisms enter the body through the mouth, the nose or through open wounds. Eating and drinking contaminated as well as open wound being exposed to the air are all sources by which the microorganisms gain entry onto our bodies. The body’s defense against the entry of pathogens and diseases can be divided into three lines of defense.
First Line of Defense
Skin a) The skin is a hard keratinized (a protein) outer layer. It serves as an effective barrier to microorganisms b) The pH value of the skin is low (pH 3-5) thus making it acidic and unsuitable for most microorganisms c) Besides the presence of the enzyme lysozyme which destroys or kills pathogen in the sweat and sebum helps the skin to ward or harmful microorganisms d) The clotting mechanism plays an important role in preventing the pathogenic microorganisms from gaining entry into body through the wound in the skin.
Mucous Membrane a) The mucous membrane as well as the cilia lining the trachea and bronchi prevents the entry of microorganisms via the respiratory tract b) Microorganisms, dust particles spores and the like get caught up in mucous secreted by numerous goblets cells and is carried by the beating cilia towards the glottis. Laughing, sneezing or vomiting aid in eliminating these foreign substances c) Besides these mechanisms, the hydrochloric acid in the stomach kill any bacteria that come into contact with the food.
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On July 30, 2009 at 10:45 am
Very nice, my friend. This is certainly a good reference for students. Thanks and have my liked it.
On July 30, 2009 at 11:45 am
Another in a series of well researched and documented articles.
On July 30, 2009 at 11:54 am
Very good write. You have a like from me. Thanks for sharing!
On July 30, 2009 at 12:15 pm
wonderfull article congrats
On July 30, 2009 at 1:44 pm
Very informative article. Thanks for sharing.
On July 30, 2009 at 2:12 pm
You always make me feel like I want to educate myself more about the human body. Great article like always.
On July 30, 2009 at 2:54 pm
Very informative and well researched. Another excellent work. Thank you for your consistent efforts to educate.
On July 31, 2009 at 12:44 am
hey friend, this another outstanding post. Thanks doctor Ghaz
On July 31, 2009 at 1:01 am
Excellent presentation!!!
On July 31, 2009 at 2:12 am
Another great article, Mr Ghaz.
On July 31, 2009 at 2:21 am
Another good article.
Thanks,
Inna
On July 31, 2009 at 4:03 am
Another informative and well researched article.
On July 31, 2009 at 9:51 am
Article shows why nutrition is such an important part of immunity. So many physical functions to keep working! Excellent article.
On July 31, 2009 at 2:17 pm
another well researched and informative article thank you
On July 31, 2009 at 3:54 pm
Great exposition.
On July 31, 2009 at 8:25 pm
Good article. Have you written about personal relationships?
On August 1, 2009 at 12:46 am
Excellent post, Mr. Ghaz
Monica.
On August 1, 2009 at 12:54 am
Way to go Mr. Ghaz. Keep up the good work.
Monica
On August 1, 2009 at 12:36 pm
Excellent article, mrghaz. Lots of information in a short article. Understandable for the lay person.
On August 1, 2009 at 8:28 pm
Long article, man.
On August 2, 2009 at 3:29 pm
Another wonderful article about the human body. I never knew there was so much to learn about immunity and the immune system. Great work as always.
Christine
On August 3, 2009 at 2:29 pm
Very well written.Thanks for sharing always.
On August 7, 2009 at 2:55 am
Very interesting read. Wonderful presentation. I loved it. Thanks for sharing. Keep it up Mr Ghaz!