Quiz #5

Question 1

Name where action potentials normally begin and where they end.

Answer 1

The begin dendrites, dendritic spines, and end in the axon terminals.

Question 2

Which ion channels open to initiate action potentials?

Answer 2

Voltage-gate Na+ ion channels

Question 3

Which ___axon with ____ diameter will have relatively fast AP condition speed?

Answer 3

A myelinated axon with a large diameter.

Question 4

What are neurotransmitters stored in prior to their release?

Answer 4

Vesicles.

Question 5

When an **action potential **arrives at an axon terminal, what ion enters to trigger the release of neurotransmitters into synapse?

Answer 5

CA2+ ion.

Question 6

What determines the effect a neurotransmitter has on a postsynaptic neuron?

Answer 6

The receptors capture and react to molecules of the neurotransmitter, altering the level of excitation of the postsynaptic.

Question 7

Which ion channel causes postsynaptic potentials to fire?

Answer 7

Excitatory PSP’s: Fire! signal.

Question 8

Which ion channel causes postsynaptic potentials to not fire?

Answer 8

Inhibitory PSP’s: Don’t fire! signal