Monday, 21 January 2013

2.15 understand the factors that affect the rate of movement of substances into and out of cells, to include the effects of surface area to volume ratio, temperature and concentration gradient

Surface area
with a larger surface area- molecules have more surfaces through which to diffuse, this increases the rate of moment

Temperature
Increased temperature means increased kinetic energy- this will mean molecules collide with the cell membrane more often making movement through it more likely

Concentration gradient
This is the difference between the concentration inside and outside of the cell. The bigger the difference is the more opportunity molecules have of diffusing.

17 comments:

  1. This comment has been removed by the author.

    ReplyDelete
  2. Haha oh yeah :P Thank you! :)

    ReplyDelete
  3. is it only cell wall or cell membrane aswell?

    ReplyDelete
    Replies
    1. Cell membrane, sorry for the mistake!

      Delete
  4. What about surface area to volume ratio

    ReplyDelete
    Replies
    1. Larger surface area to volume ratio increases rate of diffusion

      Delete
  5. hannah talks only about diffusion

    ReplyDelete
  6. Replies
    1. This comment has been removed by the author.

      Delete
    2. she got A* and she deserved it :)

      Delete
  7. Oh Hannah! You're so lucky your boards are over. Honey,I absolutely despise my life right now. I wanna switch to Netflix so bad. Pray for me. And thanks for these notes. They're incredible.

    AHHHHHH I don't wanna studyyyyyy. Sorry for ranting but not sorry also ��

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

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

    ReplyDelete
  9. more at

    http://igcse-biology-notes.blogspot.hk/2017/06/215-understand-factors-that-affect-rate.html

    ReplyDelete