Lecture 13

Question 1

A nerve poison that blocks acetylcholine receptors on dendrites would _____.

a. cause continued stimulation of the postsynaptic membrane
b. inhibit the regeneration of acetylcholine for use by the presynaptic terminals
c. inactivate acetylcholinesterase, allowing acetylcholine to persist in the synapse
d. reduce the binding of acetylcholine to its receptors on the postsynpatic membrane
e. cause an immediate and enduring depolarization

Answer 1

d. reduce the binding of acetylcholine to its receptors on the postsynpatic membrane

Question 2

An inhibitory postsynaptic potential (IPSP) occurs in a membrane made more permeable to _____.

a. potassium ions
b. sodium ions
c. all neurotransmitter molecules
e. ATP

Answer 2

a. potassium ions

Question 3

Which of the following is a direct result of depolarizing the presynaptic membrane of an axon terminal?

a. The postsynaptic cell produces an action potential.
b. Ligand-gated channels open, allowing neurotransmitters to enter the synaptic cleft.
c. Voltage-gated calcium channels in the membrane open.
d. Synaptic vesicles fuse with the membrane.

Answer 3

c. Voltage-gated calcium channels in the membrane open.

Question 4

How could you increase the magnitude of inhibitory postsynaptic potentials (IPSPs) generated at a synapse?

a. increase K+ permeability
b. increase the influx of calcium
c. increase sodium-potassium pump activity
d. All of the listed responses are correct.

Answer 4

a. increase K+ permeability