Review of B cells, CD4+ T cells and CD8+ T cells | NCLEX-RN | Khan Academy



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Review of B cells, CD4+ T cells and CD8+ T cells. Created by Sal Khan.

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42 Comments

  1. Currently preparing for Immunology Viva Voce – This content is absolute fabulous & an insight to how simply processes and mechanisms can be explained when one has a clear understanding

  2. Had chronic post viral issues for 20yrs and counting. Have had many subsets tests done and my T cells are always elevated. Very recently cd3,4,8 were elevated. Nk numbers normal range but was in a study about 12yrs ago and they tracked my nk function 6 monthly over 18months. My nk function was very low as well as my nk bright cells were low. I mostly have moderate neutropenia. Lab report usually says hypospleenic or smoker which isnt me or viral infection. My Dr from 10yrs back said it looks like viruses reactivating. They don't test viral titre levels in Australia, so lymphocyte subset test is the best we have to check for chronic viruses. My Dr quieries it Varicella or ebv or cmv or a combo as the 3 viruses I had within 6 months of each other when all my issues started. No prior issues before this. But have had 2 big shingles episodes on my head in 2015 than 2016 and many small outbreaks and chronic headaches over the infection side. I've been on famvir most of my live since 2009, if I don't get a shingles outbreak, I come down with more severe viral symptoms than if I don't use famvir.

    Anyone know of a good/safe antiviral or a way to increase nk function??? Or know anything about post viral fatigue/cfs/me?

  3. Are we running tests on the immune system before and after vaccine. I saw one doctor say it looks like it's causing what looks like autoimmunity. He ran an aids test plus looked at CD4 and CD8 protein s. The results weren't good.

  4. Thank you so much for this video. Does anyone here know if an APC dendritic cell can simultaneously have MHC class 2 and and MHC class 1 proteins, with the MHC class 2 attached to a CD4 helper T cell and the MHC class 1 attached to A CD8 T cell? I asked because my A & P textbook shows a picture of this happening and then the CD8 T cell becomes a cytotoxic T cell after activation. Please correct me if I'm wrong, but I thought dendritic cells had MHC class 2 proteins.

  5. Been watching your videos since first year of nursing. Now I’m doing my post-graduate studies and still learning from your videos! Thank you !

  6. Why is this not being talked about more when it comes to covid? This video is from 11 years ago but is relevant to the conversation we are having today. I have antibodies but never had symptoms, I do not want or need the vaccine. I would gladly join a study on natural immunity vs. vaccines.

  7. what a great video. help me clear for microbiology chapter 17 on adaptive immunity. Clear me on the T and B cell in depth. Now i cant do any wrong on my test after watching this video. thank you.

  8. I remember I used to make up these rules of 8 to help memorise which T cells need which MHC. So CD4 binds MHC2 because 4*2=8, And CD8 binds MHC1 because 8*1=8.

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