What determines the direction of the voltage change that occurs at the postsynaptic membrane?
A)the type of neurotransmitter
B)the type of second messenger system used
C)the type(s)of ions that travel through opened channels
D)the number of ion channels on the postsynaptic membrane

Question

Quizplus · Accepted Answer

The direction of the voltage change at the postsynaptic membrane is determined by the type(s) of ions that travel through opened channels. For example, the influx of positively charged ions such as Na+ or Ca2+ will depolarize the membrane potential, while the influx of negatively charged ions such as Cl- will hyperpolarize the membrane potential. The type of neurotransmitter and second messenger system used will affect the opening and closing of ion channels, but it is ultimately the movement of ions that determines the direction of the voltage change. The number of ion channels on the postsynaptic membrane can also affect the magnitude of the voltage change, but not the direction.

What Determines the Direction of the Voltage Change That Occurs