If the membranes of the cardiac muscle cells in the SA node become more permeable to potassium ions,

Name: If the membranes of the cardiac muscle cells in the SA node become more permeable to potassium ions,
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Increased permeability to potassium ions will cause more potassium ions to leave the cell, leading to hyperpolarization of the membrane potential. This will make it more difficult for the SA node to reach the threshold for firing an action potential, resulting in a decrease in heart rate.

If the Membranes of the Cardiac Muscle Cells in the SA