You Are Looking at the Electrical Activity at a Receptor

question 248

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.

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