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Urea is a waste product of cells and it diffuses from the cells and into the blood for extraction by the kidney.
Concertation gradient is the difference in concertation between two areas.
large surface are means the faster rate of diffusion
Osmosis:
Osmosis is the diffusion of water across a partially permeable membrane from a dilute solution(high) to a concentrated solution(low)
A partially permeable membrane allows water through, but wont let large molecules dissolved in water to pass through
Water movement ~
water will move to make the concertation then same on both sides of the membrane
e.g.when there is a lot of water molecules(in a dilute solution) on one side of the partially permeable membrane, but not much one the other the side(in a concertrated solution),water will move from the dilute to the concertrated solution.
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