I'm Etalie, I'm currently studying for my AS levels and will (hopefully) be posting revision entries on psychology and sociology.
I previously uploaded posts on GCSE revision. If it helps you then great! But I'm not an expert on anything AT ALL so don't rely on everything I post.
(Also, I'm not taking credit for any of the pictures or info here, it's all off google images, notes from BBC bitesize and CGP revision guides, textbooks etc)

(NB - GCSE: italics in the science subjects are things that are only in paper 2!)

Tuesday 29 April 2014

1 - STRUCTURES AND FUNCTIONS IN LIVING ORGANISMS 

 Active transport 
  • The movement of particles against the concentration gradient (from an area of lower concentration to an area of higher concentration) using energy released during respiration
eg: 
  1. Higher concentration of nutrients in blood, lower concentration in gut 
  2. Active transport - against diffusion/osmosis - against concentration gradient
  3. Allows nutrients to be taken into blood 
  4. Needs energy from respiration 
Things that affect movement of substances - 

 1. Surface to area volume ratio -(larger surface area to smaller volume ratio = substances move in/out faster) 
2. Temperature -(warmer = more energy, move faster substances move in/out faster) 
3. Concentration gradient -(big difference in concentration = substance move faster) - doesn't affect active transport
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