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I didn't realize that there were 2 different kinds of immune systems, innate and acquired. I also didn't know that t cells were part of the cell mediated response and the b cells were part of the humoral response or that there were different responses to begin with.

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I was surprised to learn how extensive and specialized the immune system is. There are so many types and different ways to defend against disease and infection, such as macrophages and dendritic cells.

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I learned that antigen stands for antibody generator. T Cells are made in the thyroid and B cells are made in bone marrow. T cells are the only cells that kill human cells, cells that are not foreign to the body, but are infected.

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I didn't know that antigen presentation is when antigen presents a chemical that identifies a pathogen to helper t cells that release interleukin 2 to get additional support to fight the invader

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I learned antigens form antibodies.

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I didn't know that technically your digestive tract is also on the outside of your body. Don't really know whether it believe that Crash Course guy or not.

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I didn't know that there are
2 types of immunity the innate immunity and the acquired and it was cool to see that they both were different and worked in different or more specific ways

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It was interesting to learn about the different chemical signals that initiate the inflammatory response such as histamine, which makes blood vessels more permeable and allows fluid to flow to the affected area. Also, histamine brings in many white blood cells to help fight off the infection.

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These videos taught me the differences between T cells and B cells. T cells kill infected cells that contain the pathogen and B cells produce antibodies that tag the antigen so that they can be identified better as being harmful and slowing them down from being infectious.

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I did not know that histamine triggers an immune response which is responsible for inflammation

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I didn't know that Acquired Immunity develops more slowing and requires the body to learn the ways of the pathogen before it defeats it. Also, only vertebrates have the acquired immune system.

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I thought it was interesting that leukocytes have the ability to go anywhere they want in the body except for the central nervous system. They can send a signal to ask a capillary to open a gap between cells and then can move through the cells to the site of the infection.

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I didn't know that antibodies could not kill invaders themselves, but instead they aid in the process of identifying the invader, so others will kill it.

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Well now Im surprised to see there are no entries yet! But that's OK, you know Im a very patient man.