Osmosis in cells - Pass My Exams: Easy exam revision notes for GSCE Biology

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-Related Topics-

· Diffusion
· Osmosis
· Active transport

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Home > GCSE Biology > Living Cells and Life Processes

*Osmosis*

Now we have established the general features of both animal and plant cells
we must also remember that many cells do look different and this is because
they have their own special jobs to do. These cells display specialised
features that make them suited to carry out their specific function.

As we know each cell is surrounded by a cell membrane. This membrane has
tiny holes in it which allow small molecules to pass through but not large
ones. Due to this nature the cell membrane is described as being partially
(or selectively) permeable.

Osmosis is a special kind of diffusion involving water molecules. It occurs
when two solutions are separated by a partially permeable membrane. The
definition of osmosis is as follows:

Osmosis is the movement of water molecules from an area of high water
concentration (weak/dilute solution) to an area of low water concentration
(strong/concentrated solution) through a partially permeable membrane.

 

Osmosis is the movement of water molecules from an area of high water
concentration (weak/dilute solution) to an area of low water concentration
(strong/concentrated solution) through a partially permeable membrane.

 

Water is actually moving both ways to try to even up the concentration,
however more water molecules are moving from the pure water towards the
sugar solution because there is a higher concentration of water molecules
in the pure water solution than the sugar solution. The result is a net
transfer of molecules down a concentration gradient from the water to the
sugar solution. Eventually


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