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The Action Potentials of Pacemaker Cells Are Due to Voltage-Gated

Question 69

Multiple Choice

The action potentials of pacemaker cells are due to voltage-gated _______ channels, which close more _______ than the voltage-gated Na+ channels of neurons and other muscle cells.


A) Na+; slowly
B) K+; rapidly
C) Ca2+; slowly
D) Ca2+; rapidly
E) K+; slowly

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