Hole's Human Anatomy and Physiology (Shier), 13th Edition

Ph.I.L.S. 4.0 Quizzing :

Ph.I.L.S. 3.0 Quizzing

1
What was the relationship between the membrane potential and the concentration of potassium outside the cell?
A)The membrane potential depolarized (became less negative) when the extracellular concentration of potassium was increased.
B)The membrane potential did not change when the extracellular concentration of potassium was increased.
C)The membrane potential hyperpolarized (became more negative) when the extracellular concentration of potassium was increased.
2
Look at your data. What is the membrane potential value that you obtained from muscle fibers bathed in a solution with a potassium concentration of 5 mEq/L.?
A)About -75 mV.
B)About -65 mV.
C)About -55 mV.
D)About +65 mV.
3
What is the value that is 15 mV more depolarized (less negative) than the membrane potential you recorded in the solution with a potassium concentration of 5 mEq/L.?
A)About -80 mV.
B)About -65 mV.
C)About -50 mV.
D)About 80 mV.
4
The action potential threshold is 15 mV above the membrane potential you recorded in the 5 mEq K/L. From your data, what [K] produced a membrane potential of around –50 mV?
A)About 5 mEq/L.
B)About 10 mEq/L.
C)About 20 mEq/L.
D)About 50 mEq/L.
5
What do you think would happen to a muscle bathed in a solution with 5 mEq K/L if you suddenly changed the solution to one with 20 mEq K/L?
A)the muscle would contract.
B)the muscle would relax.
C)the muscle would exhibit no response.
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