Diffusion Flashcards
Diffusion is
Where molecules are in constant movement because of the kinetic energy
When the molecules colide they
Change direction
The closer they are the more likely they are to
Collide
Diffusion is a
Net movement of molecules from a region of high concentration to a region of low concentration
Diffusion occurs what the concentration gradient
Down
What is not needed for this to occur
Energy
Diffusion is called why because it needs no energy
Passive process
Diffusion is fastest when
A large surface area
A short distance
A large concentration gradient
The cell membranes are thin because
They are only 2 phospholipids molecules thick
Facilitated diffusion is
This is where proteins help molecules to diffuse
Some proteins form water filled pores the do what
Span the membrane
The channels are what
Specific Meaning they only let one molecule through
Other facilitated diffusion use
Carrier protiens
Carrier proteins are also known as
As intrinsic proteins which span the membrane
When the molecule binds with the proteins
The proteins change shape
