Which of the following occurs when a membrane is stimulated due to opening of chemically gated Na⁺ channels
A)An impulse is propagated.
B)A graded potential is established.
C)An action potential is established.
D)The voltage becomes more negative.

Question

Quizplus · Accepted Answer

When chemically gated Na⁺ channels open, there is a sudden influx of Na⁺ ions into the cell, causing depolarization and the establishment of a graded potential. An impulse may or may not be propagated depending on the strength and location of the stimulus. An action potential is not established unless the membrane potential reaches the threshold for voltage-gated ion channels to open, which is typically around -55mV. The voltage becoming more negative is not a direct result of opening chemically gated Na⁺ channels.

Which of the Following Occurs When a Membrane Is Stimulated