Which of the following would result from a reduced function of the Na⁺ channels in the SA node? A) Depolarization would be delayed. B) The heart rate would decrease. C) Repolarization would not occur. D) The plateau phase would be shorter. E) Depolarization would be delayed, and the heart rate would decrease.

Question

Quizplus · Accepted Answer

The Na⁺ channels, while not a standard designation for ion channels, seem to refer to sodium channels involved in the pacemaker potential and action potential initiation in the SA node. Reduced function of these channels would delay the depolarization process, leading to a slower initiation of action potentials. This, in turn, would decrease the heart rate, as the SA node sets the pace for the heart's rhythmic contractions.

Which of the Following Would Result from a Reduced Function