9 IGCSE Biology_Cells & Transport

7/21/2019 9 IGCSE Biology_Cells & Transport

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9 IGCSE Biology:

Cells & Transport


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Cell Processes

Difusion & osmosis

Other types o cell transport


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How does water move into and out of a

cell?

Difusion andOsmosis


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The Cell Membrane

The cellmembrane hasmany unctions:

protection

obtaining ood

removing wastes

communication

interaction withother cells A soap bubble is lik

cell membrane.


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Difusion Molecules move across the cell membrane by a

process called difusion.

Difusion is the movement o molecules rom areas ogreater concentration to areas o lesser concentratio


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Difusion

Molecules moveinto or out o thecell until there is aneual number on

both sides o thecell membrane.


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Difusion

!ater molecules aresmall enough to passthrough the cellmembrane by difusio

Osmosisis the difusioo water across the cemembrane.


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Other types o cell

transport "arger moleculesli#e sugars$starches$ andproteins sometimesdifuse throughprotein channels.


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%ctive transport %ctive transportis a process that allows

molecules to move across the cellmembrane rom lower to higherconcentrations.

To do this the cell is reuired to use energ


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Other types o celltransport

% cell can ta#e inlarge particles oood byengul'ng( them.


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!hy are cells so small)

To understand why the volume o a cellincreases aster than its surace area$ let*simagine a perectly suare cell.


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!hy are cells so small)

!hich cell type has a higher volume tosurace area ratio)

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9 IGCSE Biology_Cells & Transport