GCSE Biology Diffusion
Diffusion is the passive movement of particles from an area of higher concentration to an area of lower concentration.
Most students confuse this with osmosis.
What is Diffusion?
"Diffusion is the passive net movement of particles from an area of high concentration to an area of low concentration."
Diffusion is the net movement of particles:
In the lungs, oxygen moves from the alveoli into the blood by:
In the lungs, oxygen moves from the alveoli into the blood by:
Diffusion is the net movement of particles:
Diffusion Factors
The concentration gradient, temperature, and surface area of the membrane all affect diffusion.
A larger surface area-to-volume ratio increases the efficiency of diffusion in single-celled organisms.
Gills in fish and alveoli in the lungs are specialized surfaces that maximize diffusion rate.
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