If the pacemaker cells in the SA node become more permeable to potassium ions, the
A) heart rate will increase.
B) heart rate will decrease.
C) membrane will depolarize.
D) membrane will hyperpolarize.
E) both heart rate will decrease and membrane will hyperpolarize.

Question

Quizplus · Accepted Answer

Increased permeability to potassium ions in pacemaker cells leads to hyperpolarization, making it harder to reach the threshold for depolarization, thus decreasing the heart rate.

If the Pacemaker Cells in the SA Node Become More