JustSomeoneAlone
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Can someone explain what these are:

-Active transport
-Osmosis
-Diffusion

For the Edexcel higher paper please and in bullet points.
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Eleanorroseb
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all are substances going across a membrane

active transport:
- against concentration gradient (low -> high)

osmosis
- water going with the concentration gradient (high -> low)

diffusion
- same as osmosis but with non-water substances
- with concentration gradient (high -> low)

im doing Edexcel higher too so you also got to know
Channel proteins:
-Facilitated diffusion (high -> low, molecules need a little more help to cross a membrane)

Carrier proteins:
-Active transport (low -> high, requires energy) AND facilitated diffusion (same as channel)
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Hey_itsJerome
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Active Transport- consists of the movement of charged molecles and ions eg glucose and na+ etc it requires energy so needs atp therefore a mitchondria will be present somewhere. It also uses carrier proteins and use of channel proteins.
Osmosis is the movement of water through a partially permeable membrane
Water diffuses by Osmosis from a region ofhigh Water Potential to a region oflow Water Potential through the Water Potential Gradient. Osmosis can therefore be defined as the diffusion of water from a region of high Water Potential to a region of low Water Potential through a Partially Permeable Membrane.

Diffusion- is the net passive movement of particles (atoms, ions or molecules) from a region in which they are in higher concentration to regions of lower concentration.
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JustSomeoneAlone
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(Original post by Hey_itsJerome)
Active Transport- consists of the movement of charged molecles and ions eg glucose and na+ etc it requires energy so needs atp therefore a mitchondria will be present somewhere. It also uses carrier proteins and use of channel proteins.
Osmosis is the movement of water through a partially permeable membrane
Water diffuses by Osmosis from a region ofhigh Water Potential to a region oflow Water Potential through the Water Potential Gradient. Osmosis can therefore be defined as the diffusion of water from a region of high Water Potential to a region of low Water Potential through a Partially Permeable Membrane.

Diffusion- is the net passive movement of particles (atoms, ions or molecules) from a region in which they are in higher concentration to regions of lower concentration.
thanks for the help
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JustSomeoneAlone
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(Original post by Eleanorroseb)
all are substances going across a membrane

active transport:
- against concentration gradient (low -> high)

osmosis
- water going with the concentration gradient (high -> low)

diffusion
- same as osmosis but with non-water substances
- with concentration gradient (high -> low)

im doing Edexcel higher too so you also got to know
Channel proteins:
-Facilitated diffusion (high -> low, molecules need a little more help to cross a membrane)

Carrier proteins:
-Active transport (low -> high, requires energy) AND facilitated diffusion (same as channel)
ok thanks and good luck
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Eleanorroseb
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(Original post by JustSomeRandomer)
ok thanks and good luck
you too!!!
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