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BIO 264_ Exam 2 review WITH COMPLETE SOLUTIONS
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BIO 264_ Exam 2 review WITH COMPLETE SOLUTIONS
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EUNICEBIO 264: Exam 2 review WITH COMPLETE SOLUTIONS
Terms in this set (52)
Potassium (potassium has more leak channels on the membrane than sodium, which
Which ion has greatest influence on resting
is why potassium has a higher permeability value and has more impact of resting
membrane potential?
membrane potential)
Concerning resting membrane potential, negative, positively.
the inside of the membrane is _______
compared to the______ charged outside.
T or F: F
The diffusion of K+ and Na+ down their
chemical gradients contributes to the
resting membrane potential
At resting membrane potential, extracellular sodium levels are high
______________________.
During the hyper polarization phase... K+ leaves the cell
Which is not a characteristic of a graded D
potential?
A) Spreads in a decremental fashion
B) Can result from changes in voltage
across the membrane
C) Can summate
D) Size is inversely proportional to stimulus
strength
As the stimulus strength and size of the increases; increases
graded potential _______ the action
potential frequency ______ _.
The outside of a cell during resting Positively charged
membrane potential is ______ in relation to
the inside of the cell.
If at resting membrane potential (RMP), the hyperpolarize
plasma membrane became more
permeable to K+, the cell would
_________________________.
Which ion has greatest influence on resting K+
membrane potential?
1/5
, Which statement is true? D
A) ATP is required to move Na+
extracellularly
B) Ca+ binding to specific ion channels
stops the intracellular diffusion of Na+
C) Na+ relies on a specific type of ion
channel for diffusion
D) All are true
E) Two are true
F) None are true
If extracellular concentration of K+ The increase in extracellular K+ concentration will decrease the normal K+ gradient;
increases, what will the effect be on the because of this K+ has less of a tendency to diffuse out of the cell. The resting
resting membrane potential? membrane potential becomes less negative (depolarizes).
If you increased the concentration of hardly any change in the membrane potential
extracellular Na+ of a membrane at resting
membrane potential, what would happen?
If a cell membrane became more Na+ diffuses into the cell causing depolarization.
permeable to Na+ what would happen to
the resting membrane potential?
The flu virus increases cellular membrane hyperpolarize
permeability to K+. You would expect the
cells of someone suffering from the flu to
_______.
If a plasma membrane becomes more increase, hyperpolarize
permeable to K+ the charge difference
across the plasma membrane will _____ , or
(AKA) _____ _.
If the extra cellular fluid around a muscle a hyperpolarized membrane
cell is replaced with an isotonic saline
solution that contains less K+ than the
normal extra cellular fluid, the result would
be:
2/5
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