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Introduction:

The immune system of the body is a natural defense against various diseases. It also defends the body against infections and side effects of different treatments. A strong immune system detects the difference between healthy cells and dangerous cells, and it can get rid of those that become diseases. The immune system can be strengthened and improved by new immunotherapies. These treatments are designed to repair, stimulate, or increase the body&rsquo;s natural ability to fight infections and diseases. 
 
We are surrounded by billions of bacteria and viruses. To many of them, a human being is like a walking smorgasbord, offering nearly limitless resources that they can use for energy and reproduction. Luckily for us, getting into the human body is not an easy task! 
 
From the point of view of these tiny organisms, a human is a bit like a fortress. The skin is thick and very hard to penetrate. In addition, the skin also produces a variety of substances that are harmful to invaders. Openings such as the eyes, nose, and mouth are protected by fluids or sticky mucus that captures harmful attackers. The respiratory tract also has mechanical defenses in the form of cilia, tiny hairs that remove particles. Intruders that get as far as the stomach are up against a sea of stomach acid that kills most of them. 
 
The defensive cells are more commonly known as immune cells. They are part of a highly effective defense force called the immune system. The cells of the immune system work together with different proteins to seek out and destroy anything foreign or dangerous that enters our body. It takes some time for the immune cells to be activated - but once they&#39;re operating at full strength, there are very few hostile organisms that stand a chance.

Directive:

This task is scheduled for 4 hours.
<ol>
	<li>
	Read the Introduction to the Immune System and look for the definition of all the words that are new to you.
	</li>
	<li>
	Watch the video &ldquo;Intro to how the immune system works&rdquo; (on your iTunes in the Server Library)
	</li>
	<li>
	Read the presentation about the Immune System.
	</li>
	<li>
	Make a presentation to explain the functions and importance of the immune system with your own words.
	</li>
	<li>
	Present to your team together with a plan of actions that you will take to boost your immune system and stay healthy.
	</li>
</ol>

Send your plan and conclusion to your teacher. 
 
 
 
FILES: 
 
F3.&nbsp;various references, among others.&nbsp;2002 Pearson Education, Inc., publishing as Benjamin Cummings,&nbsp;http://media-2.web.britannica.com/eb-media/28/98328-004-5514AFAC.jpg ,&nbsp;&nbsp;http://www.textbookofbacteriology.net/Phago.jpeg Phagocytosis: ingestion of pathogens by phagocytes (leukocytes/WBCs)&nbsp;http://education.vetmed.vt.edu/Curriculum/VM8054/Labs/Lab6/IMAGES/Neutrophil%20Blood%20WITH%20LABEL%20copy.jpg&nbsp;http://www.funsci.com/fun3_en/blood/blood_09.gif and more

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