You Are Looking at the Electrical Activity at a Receptor

Multiple Choice

You are looking at the electrical activity at a receptor site on the postsynaptic membrane. The measured potential is -80 millivolts (below the resting potential) . How is this possible?

A) No neurotransmitters were released into the synaptic cleft.
B) A neurotransmitter has hyperpolarized the postsynaptic membrane.
C) A neurotransmitter has depolarized the postsynaptic membrane.
D) Positive ions have entered ion channels near the receptor site.
E) The postsynaptic membrane is an axon.