Membrane Transport

Diffusion With concentration gradient Movement of particles Unequal amounts of particles Movement of particles From high To Low

Dynamic Equilibrium Equal concentrations are reached Not the same volumes Continued movement across the membrane Not gain or loss

Osmosis Movement of water From high to low Across a selectively permeable membrane

Isotonic Solutions Iso- equal No change in concentrations Water still moves Same amount moves in as moves out Both sides of membrane are the same

Hypotonic Solution Hypo- under Out side of cell Water moves into cell Less dissolved substance More water Water moves into cell

Hypertonic Solution Hyper- Over Out side of cell More dissolved substance Less water Water moves out of cell

Passive Transport Cell uses no energy From high to low Plasma membrane Concentration gradient

Facilitated Diffusion Type of passive transport Use transport proteins Channel proteins Carrier proteins Changes shape From high to low

Active Transport Cell uses energy Against concentration gradient From low to high Carrier Proteins Molecule binds with carrier protein Energy then used to change shape Molecule released on other side Carrier protein returns to original shape

Large Particle Transport Not through membrane Requires energy Exocytosis- out

Large Particle Transport Endocytosis- in

Types of Endocytosis Pinocytosis: liquid Phagocytosis: Solid

What about freshwater/saltwater cells?

Membrane Transport Bioflix At my website you can find this and the link below has a bunch of tutorials, videos, etc. Transport in action