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52 Cards in this Set

  • Front
  • Back
facilitated diffusin has a limited number of
carrier proteins
facilitated diffusion can be saturated, called
transport maximum
facilttated fifusin does not require
facilitated requires what to move molecules
c g
facilotated moves molecules _____ their c g
in facilitated, molecule to be moved binds to the _______ on the ________ of the cell
carrier pt, outside
in facilitated, the molecule binds to carrier protein on the outside, then the carrier protein _______ an the molecule is now on the _____ of the cell
changes shape, inside
in facilitated, the molecule can be released from the
carrier pt
in facilitated, if the concentration on the inside is greater than the outside, the reverse happens and the molecule is transported ______ the cell
example: transport of glucose and amino acids into muscles. insertion of carrier pt into the cell membrane is regulated by insulin
reverse facilittated
active transport can have a limited number of
carrier pt
in active transport, it can be sat. called
transport max
acitve transport requires
acitve transport moves molecules _____ their c g
primary AT energy is derived from
atp = adp + p04
in primary AT, the carrier protein has what kind of enzyme activity
primary active trans works for what molecules
na, k, ca, h, cl
primary active transport occurs at what 2 location
cell men, across intracellular mem
co transport aka
counter transport aka
molecules are moving in same direction
co transport
example: transport of na and glucose into the cell of digestive tract
co transport
molecules moved in opposite direction
counter transport
example: na and k pump
counter transport
3 binding sites for na are on the ____ of the cell
2 binding sites for k are on the ____ of the cell
with na and k pump, what kind of enzyme activity is on the inside of cell
the higher the na in the cell, the more na binds to the
the binding of 3 na to the inside of the cell activated
both na and k are moved against their
c g
the concentration of na in the extracellular fluid is
na inside the cell is what
overtime, enough na could move into the cell enough to cause
in a cell lacking ability to produce atp, it is
isosmotic and hypotonic
by pumping more positive charges out of the cell, na k pump _____polarizes the cell membrane making it more ____ on the ______
hyper; negative inside
in secondary active transport, energy is used to create a CG for ___ molecule by a ______ active pump
one; primary
2 separate transport proteins (an active pump and Na moving by facilitated diffusion) are involved in
secondary active transport
example: in the digestive tract
secondary active transport
counter and co transport can involve either
primary or secondary active transport
describes the equilibrium between CG and electromotive force for one ion
allows the calculation of the equilibrium for that ion = emf that would exactly balance the force of the CG. the calculation assumes that the membrane is fully permeable to just one ion.
can be used to calculate the actual electrical potential across the membrane at any moment in time, taking into consideration changes in membrane permeability to a number of ions
the membrane has leak channels, 100 times more permeable to
action potentials occur on ___ due to _____
axons; voltage gated channels
propagated along an axon membrane without a change in magnitude
local graded potentials occur on the _____ due to ____
dendrites and cell bodies; ligand gated
graded potentials are proportional in size to the
strength of the stimulus
local graded last longer than
action potentials
local graded last several milliseconds to hundreds of milliseconds due to the effects of
second messenger molecules and phosphorylation of ion channels
due to open na or ca channels. na or ça in membrane becomes closer to threshold potential (less negative) membrane is in an excited or facilitated state
due to open k channels. moves k out. or open cl channels, moves cl in. membrane potential is more negative - further from threshold. it will take stimulus stronger to generate an action potential
generator potential on the soma will cause the axon membrane to reach