That is either epic win or epic fail. I can't tell which.
Exact word count: 479.
The Immune System
123 Healthy Dr.
12345, KT
March 18th, 2011
Mr. Head of HBC
Head of Human Body Co., Human Body Co.
321 Body St.
56789, NY
Dear Mr. Head
The immune system is absolutely crucial to the survival of the body. Not only does it fight off diseases which would otherwise take over the body, it also stops the body from running itself dry and flooding itself at the same time.
The system has 6 main parts. It’s largely a set of blood vessel-like tubes called lymph vessels, or at the tips, lymph capillaries. These reach out and pick up liquids blood vessels sweat ouot, and other stuff just lying around in the spaces. They take the liquid, now called lymph, to large lumps called lymph nodes.
These nodes have two functions. First, they check for and try to destroy any pathogens, or disease causing things, in the lymph. Then, they produce white blood cells (WBCs) to fight diseases. They are concentrated around your neck. There is another part of the system with a very similar function.
This part is called the Spleen. Iy makes sure the blood passing through it is A-OK, and is where a large amount of your body’s WBCs come from. There are two other parts which function as miniature Spleens, the Tonsils and the Thymus. Both play a role in fighting pathogens by making WBCs.
The 6th, and most effective part, are the WBCs, also known as lymphocytes, which come in 5 types. First is the Macrophage, which is roughly Latin for “Bigger than viruses”. And guess what they do? They eat the tasty bad things up! OM NOM NOM!
Next in the line-up are the B cells, which come in Helper and Plasma forms. Helper B cells are the back-up, if Macrophages can’t finish the job. They find antigens, or little identifying bits, on the pathogen, and broadcast it around the system, activating Plasma B cells, and T cells, which we will cover later. Plasma B cells take the message about the antigen, and make a antibody, or a thing which latch onto antigens and kill the pathogen.
The fourth type is the “Killer” T cell, which come uniquely from the Thymus. They absolutely destroy anything the Helper B cells tell them too, or anything else they think shouldn’t be there.
The final type is the Memory cell. These usually come in after the pathogen is beat, and are a bit like Plasma B cells, except a lot faster, except in growth, which is why they are after. They fight off any future infections from that pathogen, before any symptoms manifest.
The system is one of the most vital possible, by protecting all the other systems from getting destroyed, and only depends on the muscle system to run the lymph vessels.
Sincerely,
The Immune System
Director Of Safety, Human Body Co.
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