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BIO 264: Exam 2 review 2024 Updated Exam Questions and Answers
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BIO 264: Exam 2 review 2024 UpdatedExam Questions and Answers
Which ion has greatest influence on resting membrane potential? - -
Potassium (potassium has more leak channels on the membrane than
sodium, which is why potassium has a higher permeability value and has
more impact of resting membrane potential)
-Concerning resting membrane potential, the inside of the membrane is
_______ compared to the ________ charged outside. - -negative, positively.
-T or F:
The diffusion of K+ and Na+ down their chemical gradients contributes to
the resting membrane potential - -F
-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 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 - -D
-As the stimulus strength and size of the graded potential _____________ the
action potential frequency ___________. - -increases; increases
-The outside of a cell during resting membrane potential is _________ in
relation to the inside of the cell. - -Positively charged
-If at resting membrane potential (RMP), the plasma membrane became
more permeable to K+, the cell would _________________________. - -
hyperpolarize
-Which ion has greatest influence on resting membrane potential? - -K+
-Which statement is true?
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 - -D
-If extracellular concentration of K+ increases, what will the effect be on the
resting membrane potential? - -The increase in extracellular K+
concentration will decrease the normal K+ gradient; because of this K+ has
less of a tendency to diffuse out of the cell. The resting membrane potential
becomes less negative (depolarizes).
-If you increased the concentration of extracellular Na+ of a membrane at
resting membrane potential, what would happen? - -hardly any change in
the membrane potential
-If a cell membrane became more permeable to Na+ what would happen to
the resting membrane potential? - -Na+ diffuses into the cell causing
depolarization.
-The flu virus increases cellular membrane permeability to K+. You would
expect the cells of someone suffering from the flu to _______. - -
hyperpolarize
-If a plasma membrane becomes more permeable to K+ the charge
difference across the plasma membrane will _________, or (AKA) _________. - -
increase, hyperpolarize
-If the extra cellular fluid around a muscle cell is replaced with an isotonic
saline solution that contains less K+ than the normal extra cellular fluid, the
result would be: - -a hyperpolarized membrane
-The resting membrane potential of a cell is = -60mV, and the intracellular
and extracellular Cl- concentrations are [Cl-]inside = 7 mM and [Cl-]outside =
105 mM, respectively. Which of the following statements is FALSE?
A) The Cl- electrical gradient is inward
B) The Cl- concentration gradient is inward
C) Both a and b are True statements
D) Both a and b are False statements - -A
-T or F:
Simple diffusion is based on the fact that molecules are in constant, random
motion. Because of collisions with each other, and anything else in the
particles way, they eventually disperse- or are evenly distributed throughout
the system. - -T
-The "All-or-None" principle - -whether the stimulus is just strong enough to
reach threshold or if it is so strong to surpass the threshold, the action
potential will proceed without stopping
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