Can someone correctly answer these basic neuro questions? 1. Which of the follow
ID: 571989 • Letter: C
Question
Can someone correctly answer these basic neuro questions?
1. Which of the following statement(s) about electrochemical equilibrium is/are false?
A. Ionic gradients are necessary for the generation of the membrane potential.
B. The size of an ion’s equilibrium potential is directly proportional to the size of the ion gradient.
C. For a given concentration gradient, the magnitude of the resulting potential is independent of the valence of the ion, but the sign is dependent on the valence.
C.The direction of the ion gradient determines the polarity of the membrane potential.
D. Electrochemical equilibrium involves the movement of a relatively small number of ions.
2.
____ A measured membrane potential of +58 mV would be consistent with _____ inside the cell and _______ outside the cell. Assume this to be a neuronal membrane permeable to the typical ions at rest.
A.100 mM K+; 10 mM K+
B.10 mM Na+; 100 mM Na+
C.10 mM Cl–; 100 mM Cl–
D.100 mM K+; 100 mM Na+
E.None of the above
Explanation / Answer
1. ANS: C is false
For a given concentration gradient, the magnitude of the resulting potential is independent of the valence of the ion, but the sign is dependent on the valence it is false. The potential dependent on the valency of the ion.
2. ANS: B
10 mM Na+ and 100 mM Na+