Which of the following are responsible for a receptor adapting to a stimulus?
A) K⁺ channel inactivation only
B) Na⁺ channel inactivation only
C) opening of Na⁺ channels only
D) opening of K⁺ channels only
E) Na⁺ channel inactivation or K⁺ channel opening

Question

Quizplus · Accepted Answer

When a receptor is exposed to a stimulus, Na⁺ channels open and cause depolarization of the receptor. This depolarization causes K⁺ channels to open as well. As a result, K⁺ efflux from the cell starts to oppose the initial depolarization. Additionally, Na⁺ channel inactivation occurs due to the depolarization. Both of these mechanisms lead to a decrease in the receptor's response to the stimulus, causing it to adapt. Therefore, the correct choice is E, which includes both Na⁺ channel inactivation and K⁺ channel opening.

Which of the Following Are Responsible for a Receptor Adapting