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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Definitions:

ABO System

The main blood group system in human blood transfusion, determined by the presence or absence of A and B antigens on red blood cells.

Adverse Reaction

An unintended, harmful reaction to a medical treatment or intervention, including medications.

Blood Products

Components of blood, such as red blood cells, plasma, platelets, and clotting factors, that are used for transfusions.

Cardiac Arrest

A sudden, unexpected loss of heart function, breathing, and consciousness, usually resulting from an electrical disturbance in the heart.