movement of substances
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what is diffusion
this is the movement of particles from an area of higher concentration to an area of lower concentration
what is osmosis
the movement of water molecules for an area of higher concentration to an area of lower concentration accrose a partially permeable membriane
what is acitve transport
this is the movement of particle agint hte contraction gradient this is by carrier proteins which are embedded in the cell membrane
how does surface are to volume ratio affect movement of substances
this means that more substance can be moved compared to the area
where is active transport used
intestine, root hair cells.
how does the intestine improve its absorption rate
thin walls so they are only on cell this is so they can be absorbed quicker. increasing in temperature
how to test for diffusion
potassium permanganate crystals added to water
where is diffusion used
alveoli to exchange oxygen and carbon dioxide also it has one cell thick so more can be transported quicker.
how to test for osmosis
visking tubing bag fill with sucrose and put in water then if the level rises osmosis has occurred
how to test for living organisms
putting potatoes into distilled water and sucrose solutions of increasing conc