Author Question: During the relative refractory period, an initial threshold-level depolarization is usually not ... (Read 70 times)

bclement10 · **on:** Apr 11, 2021

Question 1

What stops the rising phase of the action potential?
◦ The sodium activation gate closes.
◦ The Na+ activation gate opens.
◦ The Na+ inactivation gate opens.
◦ The K+ gate closes.
◦ The Na+ inactivation gate closes.

Question 2

During the relative refractory period, an initial threshold-level depolarization is usually not sufficient to initiate an action potential. Why?
◦ Only some Na+ channels have returned to their resting position.
◦ The statement is incorrect; a threshold-level depolarization always triggers an action potential.
◦ Only K+ channels are still open, so Na+ entry is offset by K+ loss.
◦ Only a few K+ channels have returned to their resting position.
◦ Some Na+ channels have returned to their resting position and K+ channels are still open, so Na+ entry is offset by K+ loss.

leahm14 · **Reply #1 on:** Apr 11, 2021

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