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Diffusion:
MOVEMENT OF SUBSTANCES IN AND OUT OF CELLS
Diffusion means particles moving from a region of high concentration (where
there are lots of them), to a region of lower concentration (where there are less
of them) ­ down a concentration gradient. No energy is needed, it is passive
(no energy).
EG: Oxygen in the alveoli moving into the blood, carbon dioxide moving into
the alveoli.…read more

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Active Transport:
Active Transport occurs when molecules need to move against the
concentration gradient (from an area of low concentration to an area of high
concentration). This requires energy.
EG: Nutrients moving from the soil into a root hair cell
EG (In Humans): Glucose moving from the nephron in a kidney back into the
blood.…read more

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