Q: Which of the following equations correctly represents the relationship between the number of action potentials and the amount of neurotransmitter released at a chemical synapse?

$$\text{Neurotransmitter released} \propto \text{Frequency of action potentials}$$

Question 1

Which of the following best describes the main difference between electrical and chemical synapses in the nervous system?

Accepted Answer

Electrical synapses involve direct cytoplasmic connections via gap junctions, while chemical synapses use neurotransmitters to communicate across a synaptic cleft.

Question 2

A patient is prescribed an SSRI for depression. What is the primary mechanism by which SSRIs increase serotonin signaling in the brain?

Accepted Answer

They inhibit the reuptake of serotonin into the presynaptic neuron, increasing its availability in the synaptic cleft.

Question 3

Which of the following events directly triggers the release of neurotransmitter from the presynaptic neuron?

Accepted Answer

Influx of Ca++ through voltage-gated Ca++ channels into the axon terminal

Question 4

Which type of postsynaptic potential (PSP) brings the membrane potential closer to threshold and is most likely to trigger an action potential?

Accepted Answer

Excitatory postsynaptic potential (EPSP)

Question 5

A ligand-gated ion channel opens when a neurotransmitter binds, allowing Na+ to enter and K+ to exit the postsynaptic cell. What is the likely effect on the membrane potential?

Accepted Answer

The cell will depolarize, moving closer to threshold.

Question 6

Which of the following best explains why closure of K+ channels in a postsynaptic neuron can lead to depolarization?

Accepted Answer

Closure of K+ channels prevents K+ from leaving the cell, retaining positive charge inside and causing depolarization.

Question 7

Which of the following is a characteristic of an inhibitory synapse?

Accepted Answer

It causes hyperpolarization or stabilization of the membrane potential, making an action potential less likely.

Question 8

A postsynaptic neuron receives input from multiple presynaptic neurons at the same time, resulting in a combined effect on the membrane potential. This process is known as:

Accepted Answer

Spatial summation

Question 9

Which of the following equations correctly represents the relationship between the number of action potentials and the amount of neurotransmitter released at a chemical synapse?

Accepted Answer

$$	ext{Neurotransmitter released} \propto 	ext{Frequency of action potentials}$$

Question 10

Which of the following best describes the role of acetylcholinesterase (AChE) at a cholinergic synapse?

Accepted Answer

It breaks down acetylcholine in the synaptic cleft, terminating the signal.

Question 11

Which type of cholinergic receptor is directly linked to a fast postsynaptic response?

Accepted Answer

Nicotinic cholinergic receptor

Question 12

A postsynaptic neuron receives two EPSPs from the same presynaptic neuron in rapid succession. What is this phenomenon called?

Accepted Answer

Temporal summation

Question 13

Which of the following best explains why the effect of a neurotransmitter depends on the type of receptor present on the postsynaptic cell?

Accepted Answer

The receptor determines the cellular response, such as opening ion channels or activating second messengers.

Question 14

Which of the following is an example of presynaptic modulation that increases neurotransmitter release?

Accepted Answer

Presynaptic facilitation

Question 15

A drug blocks voltage-gated Ca++ channels in the presynaptic terminal. What is the most likely effect on synaptic transmission?

Accepted Answer

Decreased neurotransmitter release

Question 16

Which of the following best describes the process of convergence in neural integration?

Accepted Answer

Multiple presynaptic neurons communicate with a single postsynaptic neuron.

Question 17

Which of the following is true regarding the slow response at a chemical synapse involving a second messenger system?

Accepted Answer

The neurotransmitter activates a G protein, which then activates or inhibits an enzyme to produce a second messenger.

Question 18

Which of the following best describes the effect of an inhibitory postsynaptic potential (IPSP) on the postsynaptic neuron?

Accepted Answer

It hyperpolarizes or stabilizes the membrane potential, making an action potential less likely.

Question 19

Which of the following is a real-life example of a drug that acts by inhibiting neurotransmitter reuptake, thereby increasing synaptic signaling?

Accepted Answer

Selective serotonin reuptake inhibitors (SSRIs)

Question 20

Which of the following equations best represents the graded nature of postsynaptic potentials (PSPs)?

Accepted Answer

$$	ext{PSP amplitude} \propto 	ext{Amount of neurotransmitter bound to receptors}$$

Synaptic Transmission & Neural Integration: Study Guide for ANP College Students

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