Wow. You can find the darndest things on YouTube.
For example, take a look at this 3D medical animation created by Nucleus Medical Media. It shows the body's normal antibody immune response.
Why is this of interest to sjoggies, you ask? Because in order to understand what is wrong with our immune system, first we must have a clear idea of what a healthy immune response to an invader -- or pathogen -- looks like. In this animation, it's clearly demonstrated that the Y-shaped antibodies are attacking the unwanted invader, followed by an awesome macrophage engulfing the pathogen and digesting it.
In autoimmune disease, some of our antibodies have been given the wrong task: instead of attacking pathogens, they attack healthy tissues, such as tear glands and salivary glands, and thus become autoantibodies.
Read this from the "about" tab:
This 3D medical animation shows how antibodies stop harmful pathogens from attaching themselves to healthy cells in the blood stream. The animation begins by showing normal red and white blood cells flowing through the blood stream. Next, a single pathogen appears onscreen slowly moving toward its destination on the surface of a cell. The tubular extensions on the pathogen are surface proteins which attach to corresponding surface proteins on a white blood cell, or leukocyte. As the animation continues, more pathogens continue to attach to the white blood cell, rendering it ineffective.
During the immune system response, Y-shaped antibodies begin attacking the pathogen, binding to its surface proteins as the pathogen attempts to anchor to the blood cell. The antibodies completely block the pathogen from attaching to the blood cell, "tagging" the pathogen so that one of the immune system's leaner cells, a macrophage, appears onscreen to engulf and digest the pathogen.
My favorite part is when the macrophage noms the nasty pathogen. Mmm. Tasty.