Question 1

Which of the following best describes the mechanism of signal transmission at an electrical synapse?

Accepted Answer

Gap junctions allow direct passage of ions and small molecules between neurons.

Question 2

A patient is given a drug that blocks voltage-gated calcium channels at the axon terminal. What is the most likely effect on synaptic transmission at a chemical synapse?

Accepted Answer

Decreased release of neurotransmitter due to impaired exocytosis.

Question 3

Which equation best represents the threshold condition for action potential generation at the axon hillock?

Accepted Answer

$$V_{m} \geq V_{threshold}$$

Question 4

At an excitatory synapse, which of the following occurs in the postsynaptic neuron?

Accepted Answer

The membrane potential is depolarized, producing an EPSP.

Question 5

Which neurotransmitter is most abundant in the peripheral nervous system?

Accepted Answer

Acetylcholine

Question 6

A neuron receives simultaneous EPSPs and IPSPs from multiple presynaptic neurons. Which process determines whether an action potential will be generated?

Accepted Answer

Neural integration involving both spatial and temporal summation

Question 7

Which of the following is a biogenic amine neurotransmitter classified as a catecholamine?

Accepted Answer

Norepinephrine

Question 8

At a metabotropic receptor, which sequence of events is most likely to occur after neurotransmitter binding?

Accepted Answer

Activation of a G protein, which modulates ion channels or enzymes.

Question 9

Presynaptic modulation most commonly occurs at which type of synapse?

Accepted Answer

Axoaxonic synapse

Question 10

Which of the following best describes presynaptic facilitation?

Accepted Answer

Communication at a specific synapse is enhanced.

Question 11

A postsynaptic neuron is stabilized at its resting membrane potential after neurotransmitter binding. Which type of synapse is most likely involved?

Accepted Answer

Inhibitory synapse

Question 12

Which neurotransmitter is commonly found in both the central and peripheral nervous systems and is involved in muscle contraction?

Accepted Answer

Acetylcholine

Question 13

Which of the following is a recently discovered neurotransmitter?

Accepted Answer

Nitric oxide

Question 14

A neuron fires action potentials at a higher frequency when the depolarization at the axon hillock increases. Which relationship best describes this phenomenon?

Accepted Answer

$$f_{AP} \propto (V_{m} - V_{threshold})$$

Question 15

Which of the following best explains why the response produced in the postsynaptic cell can vary for the same neurotransmitter?

Accepted Answer

The response depends on the type of receptor and coupling mechanism activated.

Question 16

Which process is most likely to occur at an ionotropic receptor after neurotransmitter binding?

Accepted Answer

Rapid opening of ion channels and immediate change in electrical properties.

Question 17

Which neurotransmitter is NOT classified as a catecholamine?

Accepted Answer

Serotonin

Question 18

A neuron receives inputs from three presynaptic neurons: two produce EPSPs and one produces an IPSP. If the combined effect depolarizes the axon hillock to threshold, what will happen?

Accepted Answer

An action potential will be generated.

Question 19

Which of the following is true regarding neurotransmitter receptors?

Accepted Answer

Multiple receptor types exist for each neurotransmitter.

Question 20

Which of the following is an example of presynaptic inhibition?

Accepted Answer

A presynaptic neuron decreases neurotransmitter release at a synapse.

Synaptic Transmission and Neural Integration: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards