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The Immune Response.

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The Immune Response The immune system is a complicated network of special cells and organs that have developed to defend the body against attacks by "foreign" invaders. When it functions properly it can fight off germs. When it doesn't function properly it can unleash a torrent of diseases, from allergy to arthritis to cancer to AIDS. The human body provides a perfect habitat for many of them and they try to break in; because the presence of these organisms is often harmful, the body's immune system will attempt to block their entry or, if that fails the immune system, will seek and destroy them. The immune system, displays several extraordinary characteristics. It can tell the difference between "self" and "nonself." It is able to remember previous experiences and react accordingly; thus, once you have had chicken pox, your immune system will prevent you from getting it again. ...read more.


The specific immune response can be separated into two parts, the Humoral (blood) Immunity and the Cell Mediated Immunity. These two connected immune functions work together. In response to germs our blood sends messages for assistance with the red blood cells, they signal that the germs should be eliminated from the body. The Cell Mediated Immune then responds with different white cells some white cells trap the germs in one place and other white cells kill them. The Inflammatory Response is the response that can be used to fight against any type of germ; it's a response that occurs no matter what type of germ it is. The inflammatory response clears the area infected by germs so that a cut can be repaired. The Three Lines of Defense: 1st line of defense: Barriers: * The Skin: * Provides a nearly impassable barrier. * Mucous Membranes: * Tears destroy germs. ...read more.


Germs are tiny little creatures, too small to see with our eyes. If they get in your body they make you sick. They make poisons that harm us. Together they become powerful armies. Germs like warm, dark, dirty places. Sunlight and nice fresh air kills them. If we eat good food it helps our body make weapons to fight them. Why do You Get Injections? Some germs have secret weapons. If a lot of them attacked at once you would become very ill. So the Doctor injects some weak germs into you. Your blood cells learn about the new special weapons from the weak germs. The blood cells work out how to destroy them after they have learnt about them. Then you are prepared for an attack. What is a Scab? Part of your blood makes a net when you are cut. Your blood cells bunch up behind the net. This makes a blood clot. Dried clotted blood becomes a scab. The scab protects you while new skin is built over the cut area. When the new skin is ready, the scab falls off. ...read more.

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