Immune System, Part 1: Crash Course A&P #45

Our final episodes of Anatomy & Physiology explore the way your body keeps all that complex, intricate stuff alive and healthy — your immune system.


  1. Dendritisk cell tar bitar ut av mikrober, far till närmaste lymfen, den letar en T-hjälpecell med rätt antikropp, den aktiveras (virgin) och börjar duplicerar, några blir i lymfen som T-minnesceller. Andra går och strider mot mikrob, andra går i mitten av lymfnoden och aktiverar B-lymfceller som duplicerar sig och börjar bilda antikroppar.

    Fagocyter konsumerar och kommunicerar ytprotein till lymfocyter.

    T-lymfocyter dödar infekterade celler

    Fagocyter kan döda kroppets egna celler om de är infekterade av virus, bakterie, cancerceller
    Infekterade celler slutar producera ett ytprotein som friska celler producerar och fagocyt gör mha enzym så att de tillför programerad celldöd

    Värme och inflammation accelerarer cellmetabolism så de kan repareras snabbare

    Lymfocytor från benmärg

    För mycket för att handla-> signalerar hypotalamus för att höja temperatur

  2. And atheists still think we came from nothing, this is only the immune system, super super simplified. How about other parts of the body? How about other species? How about the physics behind human body? The list would go for ever, and yet there are people who still think this world is without creator , that’s impossible!

  3. Is there any mistake in 5:00 ?
    Because There are two types of MHC proteins: (1)

    MHC I proteins, which present antigens to (cytotoxic T)

    cells, and (2) MHC II proteins, which present antigens

    to T helper cells.

  4. I know it's a crash course and but couldn't you go a tad bit slower , would be easier to process everything you're saying. otherwise, this is the best channel on YouTube yet !!!

  5. We've also inadvertently created our own hellish competition in nature. I think its safe to say by this point that intelligence is now part of the human immune system. Our cells are good, but we've sort of ascended haven't we? Now we have the ability to make new defences, and have, for a long time now. As soon as we started to make antiseptic, our intelligence, our brains, have been as important to our survival as our cells have. Even before that, our aversion to bitter substances may have saved our ancestors from death and disease.

    So it is fitting today that we have a scientific autoimmune response. Evolution has taken place, when we kept on making these simple organisms extinct, or tried to, with antibiotics. Eventually it was a guarantee that some would become immune to our defences. It's part of the cycle of life isn't it? But we're macro-organisms. We aren't just cells. We're billions of them. Surely that's an advantage that a mere evolutionary weight can't overcome with simple cells. Well. If you think about it, if the probability is higher than zero, it's one.

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