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Diffusion and Osmosis

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by

Maggie Green

on 17 February 2014

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Transcript of Diffusion and Osmosis

Diffusion and Osmosis
RECAP:
Diffusion and osmosis move particles from areas of high concentration to areas of low concentration using passive transport
(no energy required.

Exocytosis
Pushes larger particles out
of the cell
using active transport

* particles like waste
products
Active transport allows larger particles to pass through the cell membrane.
Endocytosis

Brings particles
into
the cell
using active transport

* particles like glucose
and protein
(things the cells need)


Selectively Permeable Membrane:
allows some molecules to move into a cell and keeps others out.
A.K.A... semipermeable
Active Transport
Uses energy (ATP) to transport particles across the cell membrane to where they're needed.
Passive Transpsort
Movement through a selectively permeable membrane
without
the use of energy
Osmosis
Diffusion of
water
only through a selectively permeable membrane
Requires no energy (passive transport)
Makes wilted plants firm again
Diffusion
Particles
randomly
move from areas of
HIGH
concentration to areas of
LOW
concentration.
or
particles go from crowded to
less crowded
NO energy
is needed for diffusion (passive transport)
transport of gases
ex. oxygen, carbon dioxide
and water
Diffusion continues until all molecules are evenly, distributed, called
equilibrium
.
Active transport moves particles from areas of
low
concentration to
high
concentration using energy
Endocytosis and exocytocytosis use active transport (need energy in the)
to move larger particles in and out of a cell.
Full transcript