Increased ____ permeability of nodal cells hyperpolarizes the SA node.
A)chloride
B)iodide
C)potassium
D)sodium
E)zinc

Question

Quizplus · Accepted Answer

Increased potassium permeability of nodal cells results in an efflux of potassium ions, causing hyperpolarization of the cell and a slower rate of depolarization. This ultimately leads to a slower heart rate, as the SA node is responsible for setting the pace of the heartbeat.

Increased ____ Permeability of Nodal Cells Hyperpolarizes the SA Node