When Two or More Graded Potentials Arrive at the Trigger

Multiple Choice

When two or more graded potentials arrive at the trigger zone, which of the following could happen?

A) An excitatory and inhibitory signal can cancel each other out.
B) Two excitatory stimuli may be additive, and summation could occur.
C) Two inhibitory stimuli may be additive, resulting in lower excitability.
D) An excitatory and inhibitory signal can cancel each other out and two excitatory stimuli may be additive, and summation could occur.
E) An excitatory and inhibitory signal can cancel each other out; two excitatory stimuli may be additive, and summation could occur; and two inhibitory stimuli may be additive, resulting in lower excitability.