_____ 1. Which of the following statements regarding the membrane potential and
ID: 3511385 • Letter: #
Question
_____ 1. Which of the following statements regarding the membrane potential and neural response is FALSE?
A. A motor neuron will fire an action potential along its axon if the number of EPSPs is greater than the number of IPSPs.
B. Adaptation allows a neuron to react sensitively to change, even against a background of steady stimulation.
C. Because the concentration of Cl- is higher outside the cell than inside, opening Cl- channels hyperpolarizes the membrane.
D. The voltage gradient across the lipid bilayer changes dramatically during the passage of a nerve impulse, causing conformational changes in voltage-gated channel proteins.
E. The resting membrane potential arises from movements of charge that leave ion concentrations on either side of the cell membrane practically unaffected and result in only a very slight discrepancy in the number of positive and negative ions on the two sides of the membrane.
_____ 2. Assume that a membrane that is permeable to Na+ but not to Cl- separates two solutions. The concentration of sodium chloride on side 1 is much higher than on side 2. Which of the following ionic movements will take place?
A. Na+ will move until its concentration gradient is dissipated (i.e. until the concentration of Na+ on side 2 is the same as the concentration of Na+ on side 1).
B. Cl- will move down its concentration gradient from side 1 to side 2.
C. A membrane potential, negative on side 1, will develop.
D. A membrane potential, positive on side 1, will develop.
E. More than one of the above is correct.
Explanation / Answer
A. A motor neuron will fire an action potential along its axon if the number of EPSPs is greater than the number of IPSPs.
E. More than one of the above is correct.
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