diffusion Flashcards
1
Q
what is diffusion
A
net movement of particles from an area of higher concentration to an area of
lower concentration
2
Q
why does diffusion occur in liquids and gases
A
as the particles can move freely randomly
3
Q
why is the cell membrane effective
A
as they hold the cell together whilst letting stuff in and out,
also substances can move in and out through diffusion, osmosis and active transport
4
Q
3 ways particles can move in and out of cells
A
diffusion, osmosis and active transport
5
Q
what is meant by selectively permeable cell membranes and example
A
that they have small holes which only very small molecules can pass through e.g glucose, water. oxygen, co2, amino acids
6
Q
how can you investigate diffusion in a non living system
A
with the visking tubing experiment
