Membrane Transport Flashcards
What are the types of gradients?
- Pressure gradients
- Electrical gradients
- Concentration gradients
Define Fick’s Law of Diffusion
Gradient = (Concentration difference)(x-area)(temp)
/ (distance)(MW)
A scientific law is
an identifiable repetitive behavior in nature which always occurs
A scientific theory is
an explanation of how or why something (like a law) always occurs
According to Fick’s law, diffusion rate has a direct relationship with
- concentration difference
- area
- temp
According to Fick’s law, rate of diffusion has an indirect relationship with
- distance
- molecular weight
Diffusion is
- a type of passive transport
- caused by random movemment of particles of fluid, gas or particles
Net diffusion is
- Passive transport
- measurable random movement of particles of fluid, gas or particles
Osmosis is
the diffusion of a solvent through a membrane from an area of low solute concentration to an area of high solute concentration
When no channel is involved, transport of a solute across a membrane is fastest when
the molecule is small, lipid soluble and carries no charge
When a channel is involved, diffusion through a membrane is fastest when
- the molecule is small, carries a positive charge
or
- the molecule is small and is non-polar
Diffusion is _____ related to lipid solubility
- directly
- Increased lipid solubility = increased permeability
Diffusion is ______ related to molecular size
- inversely
- Increased molecular size = decreased permeability
Diffusion is ______ related to electrical charge
- directly
- postive charge = increased permeability (rate)
Dialysis is the
net movement of a solute through a membrane
