The poison tetraethylammonium (TEA) interferes with normal neural communication. The toxin binds to and blocks voltage-gated potassium channels in the neuron cell membrane. Which of the following best describes the effects of TEA on the action potential?
A)The depolarization phase of the action potential fails to occur.
B)The repolarization phase of the action potential is blocked.
C)The refractory period of the action potential is shortened.
D)The action potential fails to be regenerated at the nodes of Ranvier.

Question

Quizplus · Accepted Answer

TEA blocks voltage-gated potassium channels, which normally open during the repolarization phase of the action potential to restore the resting membrane potential. Therefore, if potassium channels are blocked, the repolarization phase will be inhibited, leading to prolonged depolarization of the membrane and disrupted neural communication.

The Poison Tetraethylammonium (TEA) Interferes with Normal Neural Communication