Question

a threshold stimulus applied to an excitable membrane is one that is just sufficient to

multiple choice

trigger an excitatory postsynaptic potential.
cause a change in membrane potential.
trigger an action potential.
be conducted to the axon hillock.
depolarize a dendrite.

Explanation:

A threshold stimulus on an excitable membrane is the minimum - strength stimulus that can trigger an action potential. An excitatory postsynaptic potential can be caused by sub - threshold stimuli. Any stimulus can cause a change in membrane potential, not just a threshold one. Conduction to the axon hillock and depolarizing a dendrite are not the defining features of a threshold stimulus.

Answer:

C. trigger an action potential