Biology GCSE (1)

Transporting Substances around the Body.

The circulatory system, the blood vessels, the hearst as a pump, transport in the blood, red blood cells, effect of exercise, anerobic repiration.

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Exchange of Materials

ther are two main ways for dissolved substances to ove in and out of cells

- diffusion, down the concentration gradient

- active transport, against the concentration gradient

active transport - 

dissolved substances move from an area of low concentration to an area of high concentration 

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