KEGS Biology Blog


Monday 8th October Section 2
October 7, 2012, 10:14 pm
Filed under: Uncategorized

Osmosis and water potential

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Diffusion – the passive movement of a substance down a concentration gradient from an area of high concentration to an area of low concentration

Osmosis – a net movement of water molecules from a region of high concentration to a region of low concentration, through a semi permeable membrane (a membrane permeable to water and specific solutes).

Water potential starts at zero and goes down as the water potential becomes less – the more solute there is, the lower the water potential the lower the number is.

Ψ = Water Potential

Distilled H2O – Ψ0

Plasmolysis – where the cell membrane peels away from the cell wall

Crenation – Animal Cell shrinking (eg red blood cell)

http://www.google.co.uk/imgres?q=hypertonic+hypotonic+isotonic&um=1&hl=en&safe=off&client=safari&rls=en&biw=1280&bih=577&tbm=isch&tbnid=pjx3yqtyP25E6M:&imgrefurl=http://mcatdaily.blogspot.com/2010/05/difference-between-hypertonic-hypotonic.html&docid=k3lFq6lMLItSFM&imgurl=http://2.bp.blogspot.com/_10M5kCPMTYM/S-1kTAlmmrI/AAAAAAAAABc/Duc-LSzYgyU/s1600/Bio%252Bhypotonic,%252BIsotonic,%252BHypertonic.gif&w=800&h=490&ei=EoN0UKnoEaWi0QXrsIGABA&zoom=1&iact=hc&vpx=72&vpy=147&dur=4697&hovh=176&hovw=287&tx=131&ty=66&sig=116606023274912014267&page=1&tbnh=92&tbnw=151&start=0&ndsp=19&ved=1t:429,r:0,s:0,i:68

Comment by gautammenon1

Osmosis- net movement of water molecules across a partially permeable membrane, from an area oh ‘high water potential’ to an area of ‘low water potential’

Comment by roobennithi

using net instead of passive will get you the marks 🙂 so use rooben’s defintion

Comment by stefansoyombo




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