https://www.khanacademy.org/science/health-and-medicine/human-anatomy-and-physiology/lymphatics/v/lymphatic-system-immunity 2020-07-23T09:05:55Z The lymphatic system's role in immunity Learn about how B and T cells reside in lymph nodes. Find out how that enables them to get a preview of what they need to be prepared to fight. By Patrick van Nieuwenhuizen. Patrick van Nieuwenhuizen video https://cdn.kastatic.org/googleusercontent/RqWgqLUyfOreZOXocm9EdSEm_7tAT20GnAGlOad513p8jsfRWmy6Uf74s4P6Hd-G58yIMn23dVtrUokjGJv0g3ssIA The lymphatic system's role in immunity Learn about how B and T cells reside in lymph nodes. Find out how that enables them to get a preview of what they need to be prepared to fight. By Patrick van Nieuwenhuizen. https://cdn.kastatic.org/ka-youtube-converted/kjLwVqxwaIM.mp4/kjLwVqxwaIM.mp4 583 Parts of immune system https://www.khanacademy.org/science/health-and-medicine/human-anatomy-and-physiology/introduction-to-immunology/v/self-versus-non-self 2023-12-04T19:02:25.924542584Z Self vs. non-self immunity The immune system's main job is to fight off harmful invaders like bacteria and viruses. This is achieved through a two-step process. First, B cells and T cells that react to our own proteins are eliminated during their development. Second, even if some of these cells escape, they need a matching T cell to activate them. This system isn't perfect, and when it fails, it can lead to autoimmune diseases. Patrick van Nieuwenhuizen video https://cdn.kastatic.org/googleusercontent/vE7HtOgPInCroD7UAzjGu1kpXL4VkSpfp_yBspyQHC9y4uZgMawiTo5rF-RNGy-qm4N4RdBY6ShpwhxNP-lBW20 Self vs. non-self immunity The immune system's main job is to fight off harmful invaders like bacteria and viruses. This is achieved through a two-step process. First, B cells and T cells that react to our own proteins are eliminated during their development. Second, even if some of these cells escape, they need a matching T cell to activate them. This system isn't perfect, and when it fails, it can lead to autoimmune diseases. https://cdn.kastatic.org/ka-youtube-converted/afM6_VFaIss.mp4/afM6_VFaIss.mp4 869 Parts of immune system https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:from-cells-to-organisms/x230b3ff252126bb6:human-body-systems/a/hs-the-immune-system-review 2026-04-26T16:30:39.382257956Z Learn: The immune system review Learn about the cells and functions of the immune system. article https://www.khanacademy.org/science/ka-biology-grade-12/x406cf103e0507862:in-in-human-health-and-disease/x406cf103e0507862:in-in-types-of-immunity-and-the-immune-system/a/lymphoid-organs-review 2021-04-29T07:59:50Z Lymphoid organs review Overview of primary (thymus and bone marrow) and secondary (spleen, tonsils, Peyer's patch, appendix, MALT) lymphoid organs, and their functions. article https://www.khanacademy.org/science/shs-biology-2/x2ea931c66bba6acd:unit-1-name/x2ea931c66bba6acd:immune-system/e/hs-the-immune-system 2021-04-29T08:02:38Z The immune system Test your knowledge on the human immune system! Ashley exercise