Tiny Bombs in your Blood - The Complement System

One of the key players of our immune system is the complement system. An army of millions and trillions of tiny bombs, which work together in a complex and elegant dance to stop intruders in your body.
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  1. Kurzgesagt – In a Nutshell

    Kurzgesagt – In a Nutshell

    Maand geleden

    Our Complement System is super complex and fascinating and we can’t get enough of it - so we also made a poster and postcards with its core workings step by step. Get it here: shop.kurzgesagt.org

    • Ayşe Kocaoğlu

      Ayşe Kocaoğlu

      13 uur geleden

      Please open your turkish channel

    • hongchuan wang

      hongchuan wang

      5 dagen geleden

      Yes... complimenting is kinda hard

    • Jordi Hofmann

      Jordi Hofmann

      6 dagen geleden

      I have one question why Dir you have the german word Kurzgesagt in your Channel Name?

    • Drew Durant

      Drew Durant

      9 dagen geleden

      Kurzgesagt - In a Nutshell I always end up watching your videos at the end of my trips. Crazy world we live in.

  2. J The Nerd

    J The Nerd

    10 uur geleden

    It seems Macrophages got an upgrade since last cell video.

  3. OmNomLet


    11 uur geleden

    Bacteria: i fear no man but that thing it scares me

  4. Ayşe Kocaoğlu

    Ayşe Kocaoğlu

    13 uur geleden

    Please open your turkish channel

  5. Miss. Tool

    Miss. Tool

    15 uur geleden

    I really enjoy your videos! Especially the immune system ones, so I hope that you'll cover all parts of the immune system, one by one, because that would be very interesting to watch, as usual, thank you for your hard work!

  6. Joe ruro

    Joe ruro

    20 uur geleden

    Why isn't there a kurzgesagt style mobile game tho

  7. Uber Cena

    Uber Cena

    Dag geleden

    Kurzgesagt: Imagine being covered in flies. Now, imagine them turning into wasps. Me: *Flatlines*

  8. Medo


    Dag geleden

    I'm a programmer and this is something I'd actually like to turn into a game. Maybe take the concept of the Dyson sphere video and turn that into a game too!

  9. Kazuli The Seawing

    Kazuli The Seawing

    Dag geleden

    Bite za dusto! Oh no! Its in your eye!

  10. milli park

    milli park

    Dag geleden

    Can you explain auto immune diseases? thank you.

  11. Crusader Of the internet

    Crusader Of the internet

    Dag geleden

    2:49 c3 looks like a slightly obese monk flipping off the person behind them

  12. Memon Head

    Memon Head

    Dag geleden

    i heard a qwak sound

  13. Memon Head

    Memon Head

    Dag geleden


  14. TheDiabeticGameMaster


    Dag geleden

    This is so fucking insane and complicated that I am in awe at all the scientists who spent entire careers figuring this out for us.

  15. bepis boy

    bepis boy

    Dag geleden

    Damn... my immune system is ruthless

  16. poketdoom


    Dag geleden

    Wait bacteria can bleed?

  17. Manju Roy

    Manju Roy

    Dag geleden

    I want to be your Patron so badly but I don't have money. But one day I will

  18. 央礼


    Dag geleden

    It would be cool to have a video game based on this. Like Call of Duty style where you will play as a protein and you will kill benign cancer cells, etc. There are also bosses and unlockable characters. Imagine learning while enjoying.

  19. Eric Xie

    Eric Xie

    Dag geleden

    Complements set up camp on bacteria Bacteria: NOW THIS IS AN AVENGERS LEVEL THREAT

  20. Rocatex


    Dag geleden


  21. mathieu petitpas

    mathieu petitpas

    2 dagen geleden

    when killer queen is inside of you

  22. MrAmaceing


    2 dagen geleden

    Mind. Blown. !!!!

  23. Mr. Coffee

    Mr. Coffee

    2 dagen geleden

    Protein C3b : *This is not even my final form !!* Protein C3bBbP: *Now youve made me mad !!* Protein C5 Convertase: *HULK SMASH !!!*

  24. R- HES

    R- HES

    2 dagen geleden

    A+, again.

  25. CaramelLeek


    2 dagen geleden

    This is like 2 chapters worth of material in a grad-school level intro immunology class squeezed into 1 video. Good job!

  26. Shawn Lee

    Shawn Lee

    2 dagen geleden

    even im our immune system RNG is still needed

  27. Erimad


    2 dagen geleden

    0:57 Kirller Qween, bitesdadusto!

  28. Semih Fatih Adem

    Semih Fatih Adem

    2 dagen geleden

    ''Many mindless things can do smart things together''. Random, mindless things! There is a Designer for sure.

  29. Tenuun Javkhlan

    Tenuun Javkhlan

    2 dagen geleden

    This should be a game

  30. JW_Cat


    2 dagen geleden




    2 dagen geleden

    Voice so good

  32. Ludricus F.C

    Ludricus F.C

    2 dagen geleden

    I will never stop loving this

  33. Leon Leon

    Leon Leon

    2 dagen geleden

    in short story,war always happens everyday in our body..

  34. Chiler Snake

    Chiler Snake

    2 dagen geleden


  35. Puggy Animator

    Puggy Animator

    2 dagen geleden

    So coool, keep it up. Part 3 please!

  36. mislic 745

    mislic 745

    2 dagen geleden

    4:21 miss opportunity to say "BLOODY STREAM"

  37. Francesco De Caro

    Francesco De Caro

    2 dagen geleden

    am i the only one who is unable to see the date of release under the video? It only shows the number of subscribers now

  38. Santi


    2 dagen geleden

    we love catalysts

  39. Rama Sunmi

    Rama Sunmi

    3 dagen geleden

    Please make a video about HIV/AIDS

  40. a random guy on the internet

    a random guy on the internet

    3 dagen geleden

    C3A:*running and screaming* my immune system: why are you runnin? why are you runnin?

  41. Anankin12


    3 dagen geleden


  42. this is great

    this is great

    3 dagen geleden

    My immune system is smarter then myself then...

  43. Gojifan 9000.

    Gojifan 9000.

    3 dagen geleden

    Bacteria: oh no Virus: nope nope nope nope nope nope nope nope nope nope nope

  44. Crimson


    3 dagen geleden

    Man this shit is so complicated. Crazy to think such tiny little things means the difference between death and being able to live another day

  45. Alekss Freimanis

    Alekss Freimanis

    3 dagen geleden

    i wish i could support you, but i'm a little to young.

  46. James Bearden

    James Bearden

    3 dagen geleden

    Anyone notice how the proteins look like amazingly complex machines, and then here comes the Phagocyte looking like an newly awakened eldritch monster?

  47. Meidina Kartika Hadi

    Meidina Kartika Hadi

    3 dagen geleden

    this is insanely good

  48. Un Chico Random A Random Guy

    Un Chico Random A Random Guy

    3 dagen geleden

    Everybody gangsta till proteins become prions

  49. End Moraine

    End Moraine

    4 dagen geleden

    1:52 Upvote if you just stared at cleavage

  50. Marc Lande

    Marc Lande

    4 dagen geleden

    How do antibiotics engage infection when the immune response is not enough?

  51. Shreyashi Barik

    Shreyashi Barik

    5 dagen geleden

    Kurzgesagt: Imagine being covered in flies . Now imagine being covered in flies again. Now imagine them turning into wasps. Me: ABSOLUTELY NOT!

  52. hacker of medibang

    hacker of medibang

    5 dagen geleden

    I got some questions... Anyone can answer, dont worry. 1.- ¿Does all Virus are bigger that cells? 2.- This looked like only a few Virus were in human body. I dont think so because Virus are so small... ¿the inmune sistem takes more to eliminate them than this video?

  53. JJ Supreme

    JJ Supreme

    5 dagen geleden


  54. ibrainrmhm


    5 dagen geleden


  55. InfinityTower


    5 dagen geleden

    remember the ebola and infection videos? the art style has come a long way...

  56. Gus' Channel

    Gus' Channel

    5 dagen geleden

    "many mindless things can do smart things together" "this video was made possible, by... You"

  57. CanalDoRayne


    5 dagen geleden

    Obrigado por colocar legendas em português nos vídeos. São muito bons os vídeos!

  58. Commonwealth Of Ascension

    Commonwealth Of Ascension

    5 dagen geleden

    I can imagine a Total War type game being made out of this. Imagine the unit shouts? Macrophage Comitatenses!

  59. Jar Jar Binks

    Jar Jar Binks

    5 dagen geleden

    Good to know there are billions upon billions complements for me. (:

  60. Mr. sir

    Mr. sir

    6 dagen geleden

    So what I get from this is, bacteria have there own bacteria.