Flashcards in Chapter 3 Deck (72)
particles are driven through a selectively permeable membrane by hydrostatic pressure
the net movement of particles from area of high concentration to low concentration
factors affecting diffusion (5)
-steepness of concentration gradient
-membrane surface area
What can diffuse through lipid bilayer? (3)
What can diffuse through channel proteins? (3)
how can you increase the rate of osmosis?
# of osmoles (particles) of solute per liter of solution
tonicity; what does it depend on?
-ability of a solution to affect fluid volume & pressure in a cell
-concentration & permeability of solute
2 types of carrier mediated transport
transport proteins are ___ for certain ligands
facilitated diffusion (2)
-carrier mediated transport of solute through a membrane down its concentration gradient
-does not require ATP
primary active transport (2)
-carrier moves solute through a membrane up its concentration gradient
what type of transport is Na-K pump?mechanism?
-primary active transport
-uses 1 ATP and pumps 3 Na(out) for 2 K(in)
carries only one solute at a time
carries two or more solutes (different) in the same direction
carries two or more solutes in opposite directiones
carrier mediated transport
transport proteins in the plasma membrane that carry specific solutes from one side of the membrane to the other
carrier mediated transport:as the solute concentration ____, the rate of transport _____, but only to a point
purpose of Na-K pump?
to maintain negatively charged resting membrane potential
secondary active transport
carrier moves solute through membrane but only uses ATP indirectly
moves large particles, liquids, or numerous molecules at once through the membrane in vesicles
bring material into the cell
engulfing large particles
taking in droplets of ECF containing molecules useful in the cell
discharging material from the cell
collection of filaments and cylinders that determine shape of cells and lead structural support
what is the cytoskeleton composed of?
what organelle is the largest?
what are the organelles in the cell? (6)