TERMS ASAP Flashcards
factors affecting permeability
size: small molecules move through the spaces more readily
Polarity: non-polar molecules dissolve in and move through the membrane more readily
Charge: molecules that are electrically uncharged move through more readily
the direction of movement is determined by:
chemical potential
Electric potential
hypertonic
outside
-cell can shrink
-salt water/ocean
- lots of stuff outside
Hypotonic
inside
-lots of stuff inside
-cells get bigger and expand
-freshwater fish
isotonic
=
-always movement
-same amount inside and out
since many solutes cannot diffuse through the membrane, it is left to do….
diffuse to equalize the concentration gradient
osmotic pressure
H2O moves to salty solution
Assisted Transport
solution is that integral proteins carry molecules across the membrane
Pjospholipids
-amaphelllic molecules that form a bylayer
four ways proteins can function
- transport molecules
- enzymes
3.membrane recpotors - attachment to cell cytoskeleton
Facilitated diffusion
-transport with the concentration gradient HIGH to LOW so the cell does need to use energy
-gated channels open in close
-
Active transport
pumping of molecules or ions across a membrane graident
-requires an integral protien called a tranport to carry the moleciles and use ATP
Endocytosis brings things where?
in the cell
two types of endocytosis?
Pinocytosis (liquids
Phagocytosis (solids)
PInocytosis (Liquids)
makes indent and pinches off and creates a vacuole
