A&P exam 1 (part 4)
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A&P exam 1 (part 4)
mechanisms membrane transport 2014 fall
mechanisms of membrane transport resting membrane potential
net movement of molecules from high concentration to low until equilibrium is recorded
t or f, molecules do not like to be in small groups
does diffusion always take place in one direction?
no, it can go both directions at the same time
this type of diffusion has its own type of terminology
movement of water
molecules diffuse according too?
its own concentration gradient
differentially permeable membrane occurs with what type of diffusion?
a cell membrane has a ?
differentially permeable membrane
if a membrane is permeable, it can ?
pass through cell molecule
if a membrane is impermeable is can?
not pass through cell molecule
diffusion of H2O across a differentially permeable membrane?
during osmosis water diffuses from?
high to low concentration
with osmosis you are interested in the ?
solvent not the solute
a 5% glucose solution = 95% water solution, which has the greater concentration of water?
the 5% glucose solution
10% glucose solution = 90% water solution, which has the lower concentration of water?
the 10% glucose solution
a problem that occurs with osmosis is when you are ?
dealing with solutions
tonicity only works for?
comparing 2 solutions
the solution on the inside of a cell is always gonna eb?
the solution in tonicity that is outside of the cell could be?
what is used to drive molecules across a cell membrane
movement of molecules only occurs if being helped, can go in either direction
can go against concentration gradient, but it only used when they absolutely have to
osmosis is the ?
what acts as channels to facilitate movement from low to high concentrations
what uses proteins as pumps, supplied with energy to move molecules across the concentration gradient
type of active transport?
moving larger quantities of material across membranes using vacuoles
uses vacuoles (vesicles)
ex of bulk transport?
soap bubbles; little ones coming together and bigger ones separating
brings larger materials into the cell
bringing solid material in during endocytosis
bringing liquid material in during endocytosis
3 parts of endocytosis?
receptor mediated endocytosis
membrane bounded space?
bulk transport requires?
concentration of solute is same of inside and outside of cell
concentration of water is the same
the solutions are isotonic to one another
no net movement of water?
concentration of solute in X1 is greater than X1
X1 is hypertonic
X2 is hypotonic
more concentrated, concentrated solutions
water always diffuses from?
hypotonic to hypertonic
to determine what will happen to cell, it involes the ____ and you are answering for the ___
eject to exterior, isn't differentiated by solid/liquid
lets out various mixtures of compounds made in other organelles, ex, secretions, digestion
what is bulk transport used for?
to solve problem of diffusing large particles
incorporated into cell as a coated vesicle?
LDLs through membrane by RME
differentiate by size, measure of EPD difference
the greater the ____, the greater the difference
have charge associated with it
distribution of ions inside the cell must be different from?
ions outside the cell
electrical potential difference includes?
voltmeter compares 2 parts based on placement of electrons
measuring potential difference
what does the voltmeter measure?
magnitude of difference?
the magnitude of difference is the charge?
outside the cell
characteristic of all living cells, doesn't matter what type of cell
the resting membrane potential has a ?
specific charge and only one type of membrane potential
typical voltage in cells?
caused by distribution of ions inside cell vs outside
resting membrane potential
with resting membrane potential, the charge is?
across the cell membrane
with RMP all pairs or points (in or out) are?
isoelectric to each other
phrase to remember for RMP?
negative to positive, inside to outside
Vm is a characteristic of?
all living cells
cell membranes are?
polarized, which is the state
reduce the state
4 ions the affect RMP?
intracellular/extracellular ion # for K+
intracellular/extracellular ion # for Na+
intracellular/extracellular ion # for Cl-
intracellular/extracellular ion # for charged proteins?
in the distribution of ions, the net charge?
causes charge across cell membrane
force acting on ions trying to drive them from side of high concentrations to low
concentration gradients, or force acting on ions
if gradients were uneven, it would?
diffuse through membrane and eventually become even again
used to pump sodium out as it is leaked to the inside
active transport (ATP)
cell membrane is _____ to protein
protein can not pass through ? meaning?
the cell membrane
all protein is on the inside because it can not get out
with the sodium potassium pump what happens?
it pumps 3 sodiums out and brings 2 in
how much of energy cell burns is used to maintain RMP of sodium and the sodium pump?
the sodium potassium pump runs?
all the time
the cell membrane is _____ permeable to sodium
what does slightly permeable mean?
it can slowly diffuse to inside, kinda leaky
sodium is pumped out as it comes in to maintain?
concentration using active transport
concentration of potassium is?
cells only use active transport when?
they absolutely have too
the size of charge is important in?
resting membrane potential