Download Transparency – Diffusion Through a Selectively Permeable Membrane

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Transcript
Transparency – Diffusion Through a Selectively Permeable Membrane
The particles of scent in the demonstration moved
from areas of high concentration (where it was
sprayed) to areas of low concentration (the corner
furthest from the origin) by a process called
diffusion. Diffusion (and a process called osmosis
for water) is the method used in the body to get
materials into and out of the cell.
The membrane works like this:
_____ _____ _____ _____
_____ _____
Substances that are small enough to pass through the
selectively permeable membrane may enter or leave
the cell. Substances that are too large to pass through
will either not enter, or will be trapped inside the cell.
The lab activity will demonstrate how the process of
diffusion works.