25 Comments Add yours

1. ruturajmaharaja7
   October 21, 2009
   11:32 am

   looks like you had …
   looks like you had a nice class from Mrs. Khan
2. clerlic
   October 21, 2009
   11:32 am

   Does human body …
   Does human body have any protective measures against cancer?
3. LucianaPE
   October 21, 2009
   11:32 am

   Sal, you are …
   Sal, you are amazing! Its such a talent to be able to take any subject and break it down to the simplest explanation. Keep on posting and good luck to you!
4. loading44
   October 21, 2009
   11:32 am

   Wow,, I’m really …
   Wow,, I’m really starting to think that you know everything!
5. andresblazeit420
   October 21, 2009
   11:32 am

   you explained it …
   you explained it very well
6. tenshady
   October 21, 2009
   11:32 am

   Thank you SAL,

   …
   Thank you SAL,

   Health & happiness

   To You All
7. MrSymposier
   October 21, 2009
   11:32 am

   Nice explanation of …
   Nice explanation of how cancer “spreads”. There is more information on cancer at Symposier site for physicians interested in related topics or just looking for medical topics, they can also share and deepen their knowledge with other physicians.
8. ose90
   October 21, 2009
   11:32 am

   Thanks Sal for your …
   Thanks Sal for your explanation.

   Mutated cells will undergo apoptosis , programme cell death, triggered by granzyme which is released by interferon such as Natural Killer cell or cytotoxic T lymphocytes.

   When the immune system of a person is impaired or weakned by various sources such as processed foods and vaccinations, these NK cells and cytotoxic lymphocytes couldn’t work well or maybe are insufficient to kill all the tumor cells, resulting in malignant cancerous cells spreading.
9. ltlegenda
   October 21, 2009
   11:32 am

   it’s interesting
   it’s interesting
10. ose90
    October 21, 2009
    11:32 am

    - spreading without …
    – spreading without control, thus infiltrating various parts of the body.

    However, for a working immune system, the NK cells and cytotoxic T lymphocytes will be able to kill all the tumor cells, preventing malignant cancer cells from causing havoc.

    Everyone has cancer cells being produced everyday but why most don’t develope tumors? This is because they have a fully functional immune system.

    Just some thoughts
11. zx6rtt
    October 21, 2009
    11:32 am

    excellent …
    excellent information, as usual

    thanks for the upload

    : ]
12. DeViLiN888
    October 21, 2009
    11:32 am

    Thats amazing. …
    Thats amazing. Firstly, I started with mathematics videos and now, biology!!! Amazing! I hope there will be some anatomy or astronomy videos. Thank you Sal. You are the reason why l like internet and new (information) age. Accessible high quality education. You spread happiness around the world! THANK YOU! Your student from New Zealand
13. gopherchuckz
    October 21, 2009
    11:32 am

    great vid. lol …
    great vid. lol actually able to understand that more now.
14. xxmichoxx
    October 21, 2009
    11:32 am

    lol cellular …
    lol cellular psychopath
15. latewire
    October 21, 2009
    11:32 am

    averted/everted
    averted/everted
16. quincy451
    October 21, 2009
    11:32 am

    “something wrong …
    “something wrong with my brain”. don’t think so. Your brain works great. It takes the most complex subjects and makes them simple to understand. You are like the professor in college you wanted to take over and over.
17. latewire
    October 21, 2009
    11:32 am

    I learned this …
    I learned this stuff a year ago.

    As for youtube being bad, I wouldn’t care if a rocket scientist learned calculus from Khan. If it gets an “A” on the test in class, it’s accurate enough to learn from.
18. normalpeople
    October 21, 2009
    11:32 am

    two of my relatives …
    two of my relatives just died from cancer last 2 days.
    maybe I should learn something from here so that i help the people suffering from various type of cancer in the future…
19. helgihg
    October 21, 2009
    11:32 am

    I actually learned …
    I actually learned this while learning physics, specifically why some types of radiation can cause cancer by upsetting the electrical state of atoms in a DNA molecule.

    Khan, brilliant as always. Keep it up!
20. valhala56
    October 21, 2009
    11:32 am

    Haha! for a soon to …
    Haha! for a soon to be Dr you need to lighten up. I’m 53 compared to what I absorbed in College to what I absorbed the following years I would call it a ratio of .01% to 89%.
    Youtube is awesome. I have learned more in 3 years of YouTube then I would have learned in a decade of Univeristy.
    Good luck to you kid!
21. 01467603
    October 21, 2009
    11:32 am

    haha. you’re …
    haha. you’re covering cancer now. what next…
22. FHomeBrew
    October 21, 2009
    11:32 am

    I’m hoping AIDS or …
    I’m hoping AIDS or something. I’ve been wondering how that works.
23. psproot
    October 21, 2009
    11:32 am

    what screen …
    what screen recorder did you use for this video
24. xb0xher0
    October 21, 2009
    11:32 am

    excellent …
    excellent insightful vids sal! Keep it up.
25. hacksign000
    October 21, 2009
    11:32 am

    thank you ! I …
    thank you ! I understand it now