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Transport around the body

Transport in simple organisms

One main way substances move in and out of cells is by diffusion

Diffusion: the movement of particles in a liquid or a gas down a concentration gradient from an
area where they are at a relatively high concentration to an area…

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A system of vessels that carry substances: these are usually tubes, sometimes following a very
specific route, sometimes widespread and branching
A way of making sure that substances are moved in the right direction e.g. nutrients in and out
A suitable transport medium
A means of moving materials fast enough…

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