Movement of fluids in cells
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Movement of Fluids in Cells. The Cell Membrane. By the late 18 th century, microscopes had shown that all cells have one structure in common. This was the cell membrane , which holds the cell together. It allows some substances to pass into

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The cell membrane
The Cell Membrane

By the late 18th century,

microscopes had shown that

all cells have one structure

in common. This was the cell

membrane, which holds the

cell together. It allows some substances to pass into

the cell, but excludes others. For this reason, it is

called a semi-permeable membrane.


Diffusion
Diffusion

Diffusion is the process of particles moving, in order to

balance their concentrations. For example, if a single sugar

cube is placed in a cup of tea, and left to sit, the sugar will

eventually dissolve, and will spread evenly (diffuse)

throughout the solution. The solute will always move

from an area of high

concentration, to an area

of low concentration, in

order to make the

concentration balanced.



Osmosis
Osmosis

Sometimes,

molecules may

be too large to

pass through a

membrane. In

this case, water

molecules will pass across the membrane, in order

to attempt to balance the concentrations on both

sides. This process is called osmosis.


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