quizzes 4-6

Question 1

How does information transfer occur at chemical synapses?
You Answered

Electrical depolarization of the nerve terminal leads to current flow directly from the presynaptic cell to the postsynaptic cell through connexons (or gap junctions).

Electrical depolarization of the nerve terminal causes presynaptic calcium channels to open, leading to the direct excitation of the postsynaptic cell.

Electrical depolarization of the nerve terminal causes the release of chemicals that open postsynaptic ligand-gated ion channels which pass current, depolarizing the postsynaptic cell.

Electrical depolarization of the nerve terminal directly opens postsynaptic ligand-gated ion channels, which pass current, depolarizing the postsynaptic cell.

Electrical depolarization of the nerve terminal leads to current flow directly from the presynaptic cell to the postsynaptic cell through voltage-gated ion channels.

Answer 1

Electrical depolarization of the nerve terminal causes the release of chemicals that open postsynaptic ligand-gated ion channels which pass current, depolarizing the postsynaptic cell.

Question 2

Dendritic spines are commonly a site for

both excitatory and inhibitory synaptic transmission

inhibitory synaptic transmission.

excitatory synaptic transmission.

storage of transmitter molecules.
active zones.

Answer 2

excitatory synaptic transmission.

Question 3

How does acetycholinesterase function at synapses that release acetylcholine?

It is a postsynaptic muscarinic receptor blocker.

It is a postsynaptic nicotinic receptor blocker.

It is a synaptic cleft enzyme that breaks down acetylcholine receptor proteins.

It is a presynaptic calcium channel agonist.

It is a synaptic cleft enzyme that breaks down the transmitter acetylcholine.

Answer 3

It is a synaptic cleft enzyme that breaks down the transmitter acetylcholine.