osmosis and diffusion - SB1 Flashcards
1
Q
what is diffusion?
A
particles moving from areas of high concentration to low concentration - particles travel from inside the cell to outside
2
Q
what is osmosis
A
water molecules moving from an area where the water molecules are in higher concentration, to an area where they are in lower concentration, through a semi permeable membrane.- particles transfer from outside the cell to in
3
Q
what is concentration?
A
the amount of particles of a substance within a defined volume
4
Q
what is gradient?
A
difference between concentration of particles (usually on 2 sides of a membrane)
5
Q
what does semi permeable mean?
A
only allows certain particles to go through
6
Q
do diffusion and osmosis use energy?
A
no
