Thursday, 3 January 2013

2.1 describe the levels of organisation within organisms: organelles, cells, tissues, organs and systems.


Organelles are highly organised structures of molecules. They have a specific function within a cell. Mitochondria is an example, generating energy for our bodies cells.

Cells are made up of Organelles, described as a functional unit, they are the basis of living things.

Tissues are a collection of similar cells all serving a common function.

Organs are made up of several kinds of tissues together forming a functioning unit.

Systems are several organs forming an organ system. Like the cardiovascular system is made up of the heart, blood and blood vessels.

This animation sums up the above nicely, worth a watch: http://wps.pearsoncustom.com/wps/media/objects/3014/3087289/Web_Tutorials/01_A02.swf
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24 comments:

  1. Unknown24 August 2013 at 23:12

    Thank you! Your blog helped me out so much! xx

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  2. HannahHelp25 August 2013 at 03:00

    No problem! I hope you got the grades you wanted xx

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  3. Unknown18 November 2013 at 08:15

    So useful thank you so much

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  4. Unknown23 December 2013 at 07:28

    I meant your blog Hannah

    ReplyDelete
  5. CatLover694428 December 2013 at 02:35

    Yay, so glad I found this! Now I can check my revision notes alongside something reliable! Thanks very much! :)

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  6. Unknown27 May 2014 at 23:12

    Thanks this entire blog has helped so much please make more !!

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  7. Unknown27 May 2014 at 23:13

    This comment has been removed by the author.

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  8. Unknown4 June 2014 at 11:04

    THIS IS AMAZING! THANK YOU SO MUCH!

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  9. Unknown10 May 2015 at 23:52

    good

    ReplyDelete
  10. Unknown28 May 2015 at 09:17

    This comment has been removed by the author.

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  11. Unknown28 May 2015 at 09:39

    This comment has been removed by the author.

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  12. Anonymous18 July 2016 at 04:14

    WOW!! thank you so much, this was beyond helpful!!!!

    ReplyDelete
  13. Anonymous14 March 2017 at 11:41

    Hanna You are the lifeline of every kid doing their GCSEs.

    ReplyDelete
  14. Unknown1 April 2017 at 09:44

    Thanks so much Hannah

    ReplyDelete
  15. Unknown21 May 2017 at 07:44

    This comment has been removed by the author.

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  16. Unknown21 May 2017 at 07:44

    hannahs a class A pocketnonce

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  17. Unknown21 May 2017 at 07:45

    GCCSSSEEEESS UR HAVING A LAUGH HEMEL HEMSTEAD UR HAVING A LAUGH

    ReplyDelete
  18. Mike Tsang26 June 2017 at 02:33

    The Biology Syllabus has changed.... New Syllabus Blog:

    http://igcse-biology-2017.blogspot.hk

    ReplyDelete
  19. SophieRice26 June 2017 at 06:35

    This comment has been removed by the author.

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  20. SophieRice26 June 2017 at 07:16

    Find more at:

    http://igcse-biology-notes.blogspot.hk/2017/06/21-describe-levels-of-organisation.html

    ReplyDelete
  21. unknown24 December 2018 at 04:40

    still saving GCSE students in 2019 hannah
    all the way from 2013
    great work
    helped me so much

    ReplyDelete
  22. Unknown10 February 2020 at 10:55

    2020?

    ReplyDelete

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