The Human Body 's Defense System

1386 Words Nov 4th, 2015 6 Pages
The immune system is our body 's defense system – it is vital to our body 's health and survival. We need the immune system to fight off bacteria, viruses, and other foreign, harmful substances - as well as our own cells that have become bad or even cancerous. There are several building blocks that make up the system as a whole, each just as important as the next, that work hand-in-hand. This includes the lymphatic system, biological molecules, antibodies, white blood cells, the tonsils, thymus, bone marrow, and the spleen. The tonsils and thymus both create antibodies, while bone marrow (among other things) creates white blood cells, which are crucial to fighting off infection. The lymphatic system carries waste as well as nutrients, and lymph fluid throughout the body in the blood stream. The lymph nodes act as a strainer or filter, so when the lymph fluid travels through, it traps virus 's, bacteria, and any other substance that 's foreign to your body. These things are then destroyed by lymphocytes, which are specialized white blood cells. The spleen, which also works as a filter, gets rid of aged or damaged platelets and blood cells, and also destroys bacteria and other harmful or foreign substances. When an autoimmune disease occurs, it is because the body has triggered an inflammatory defense response when there is nothing to protect the body from. Inflammation is what happens when white blood cells and immune proteins are fighting off infection. The immune system…
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