Membrane Transport Diffusion With concentration gradient Unequal amounts

Membrane Transport

Diffusion • With concentration gradient – 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 – 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