Which of the following characteristics are true for an action potential?
I-A threshold potential must be exceeded for an action potential to occur.
II-A stimulus either produces a full action potential or none at all.
III-During the refractory period it is less likely that stimuli can produce another action potential.
A)I only
B)I and II
C)II and III
D)I and III
E)I,II,and III

Question

Which of the following characteristics are true for an action potential?
 I-A threshold potential must be exceeded for an action potential to occur.
II-A stimulus either produces a full action potential or none at all.
III-During the refractory period it is less likely that stimuli can produce another action potential.
A)I only
B)I and II
C)II and III
D)I and III
E)I,II,and III

Quizplus · Accepted Answer

All three statements are true regarding action potentials. I) An action potential requires the threshold potential to be exceeded to initiate. II) The all-or-none principle states that a stimulus triggers a full action potential or none at all. III) During the refractory period, it is more difficult for another action potential to be initiated due to the temporary inactivation of Na+ channels and the ongoing process of returning to resting potential.

Which of the Following Characteristics Are True for an Action