Indicate whether the statements below are true or false. If a statement is false
ID: 197158 • Letter: I
Question
Indicate whether the statements below are true or false. If a statement is false, then rewrite it to make it a true statement.
a.Neurotransmitters are small molecules released into the synaptic cleft after the fusion of synaptic vesicles with the presynaptic membrane.
b.Action potentials are usually mediated by voltage-gated Ca2+ channels.
c.Voltage-gated Na+ channels become automatically inactivated shortly after opening, which ensures that the action potential cannot move backward along the axon.
c.Voltage-gated K+ channels also open immediately in response to local depolarization, reducing the magnitude of the action potential.
Explanation / Answer
a. True.
b. False.
The true statement is: Action potentials are usually mediated by voltage-gated Na+ channels.
c. True.
d. False.
The true statement is: Voltage-gated K+ channels do not open immediately in response to local depolarization. In fact, they respond very slowly compared to voltage-gated Na+ channels and do not affect the magnitude of the action potential.