Question 1

Which of the following best describes the initial cellular event that triggers the generation of an action potential in a neuron?

Accepted Answer

Depolarization of the membrane to threshold, causing voltage-gated sodium channels to open and $$Na^+ to $$rapidly enter the cell

Question 2

Long-Term Potentiation (LTP) is most directly associated with which of the following changes at the synapse?

Accepted Answer

Insertion of additional AMPA receptors into the postsynaptic membrane, increasing synaptic strength

Question 3

A drug that acts as an antagonist at neurotransmitter receptors would most likely:

Accepted Answer

Bind to the receptor and block the neurotransmitter from binding, preventing activation

Question 4

Which of the following best explains how cocaine increases neurotransmitter levels in the synaptic cleft?

Accepted Answer

It blocks the reuptake transporters, preventing neurotransmitter removal from the synapse

Question 5

During the peak of an action potential, which of the following occurs?

Accepted Answer

Voltage-gated sodium channels inactivate and voltage-gated potassium channels open, allowing $$K^+ to $$exit the cell

Question 6

Which of the following is a direct effect of high-frequency stimulation in the induction of LTP?

Accepted Answer

A large release of neurotransmitters, such as glutamate, from the presynaptic neuron

Question 7

A patient is given a drug that inhibits monoamine oxidase (MAO). What is the expected effect on neurotransmitter levels in the synaptic cleft?

Accepted Answer

Increased levels of monoamine neurotransmitters due to decreased breakdown

Question 8

Which of the following best describes the role of calcium ions ($$Ca^{2+}) in $$the induction of LTP?

Accepted Answer

Calcium influx through NMDA receptors activates signaling pathways and protein kinases that strengthen the synapse

Question 9

A drug that blocks the enzyme tyrosine hydroxylase would most likely result in:

Accepted Answer

Decreased synthesis of catecholamines like dopamine and norepinephrine

Question 10

Which of the following is a key difference between graded potentials and action potentials?

Accepted Answer

Graded potentials can summate and vary in amplitude, while action potentials are all-or-none and propagate without decrement

Question 11

Which of the following best describes the effect of a selective serotonin reuptake inhibitor (SSRI) on synaptic transmission?

Accepted Answer

It blocks the reuptake of serotonin, increasing its concentration in the synaptic cleft

Question 12

Which of the following steps occurs LAST during the generation of an action potential?

Accepted Answer

Return to resting membrane potential by the sodium-potassium pump ($$Na^+/K^+-$$ATPase)

Question 13

A drug that mimics the structure of a neurotransmitter and activates its receptor is called:

Accepted Answer

An agonist

Question 14

Which of the following is a plausible consequence of blocking neurotransmitter reuptake in the synaptic cleft?

Accepted Answer

Increased duration and intensity of postsynaptic signaling

Question 15

Which of the following best explains why LTP is considered a cellular mechanism for learning and memory?

Accepted Answer

LTP causes persistent strengthening of synapses, making it easier for new memories to be formed and reinforced over time

Question 16

A drug that increases the release of dopamine into the synaptic cleft would most likely:

Accepted Answer

Increase postsynaptic signaling and potentially cause overstimulation

Question 17

Which of the following is the correct sequence of events during an action potential?

Accepted Answer

Depolarization to threshold $$\rightarrow$$ Opening of voltage-gated $$Na^+$$ channels $$\rightarrow$$ Inactivation of $$Na^+$$ channels and opening of $$K^+$$ channels $$\rightarrow$$ Repolarization $$\rightarrow$$ Return to resting potential

Neural Communication: Synaptic Transmission, Long-Term Potentiation, and Action Potentials

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