You Are Looking at the Electrical Activity at a Receptor

question 171

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

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