Particles move
across the cell
membrane from an
area of HIGH
concentration to an
area of LOW
concentration
**DOES NOT REQUIRE
ENERGY**
Water moves
across the cell
membrane from
an area of HIGH
concentration to
an area of LOW
concentration
**DOES NOT REQUIRE
ENERGY**
LARGER PARTICLES
move through a
protein channel from
an area of HIGH
concentration to an
area of LOW
concentration
**DOES NOT REQUIRE
ENERGY**
LARGER PARTICLES
REQUIRE ENERGY
to move through a
protein channel
from an area of
LOW concentration
to an area of HIGH
concentration
**REQUIRES ENERGY**
= Water
= Water
= Particle
Protein Channel
Protein Channel
= Large Particle
ATP
= Water
= Water
= Particle
= Large Particle
ATP