Question 1

Which region of the neuron is primarily responsible for the reception of synaptic signals from other neurons?

Accepted Answer

Dendrites

Question 2

The resting membrane potential of a neuron is mainly established by which of the following mechanisms?

Accepted Answer

Diffusion of ions and selective permeability of the membrane

Question 3

Which equation best describes the equilibrium potential for a single ion across a neuronal membrane?

Accepted Answer

$$E_{ion} = \frac{RT}{zF} \ln \left( \frac{[ion]_{out}}{[ion]_{in}} \right)$$

Question 4

A graded potential is most likely to occur in which part of the neuron?

Accepted Answer

Dendrites and soma

Question 5

Which of the following best describes the difference between graded potentials and action potentials?

Accepted Answer

Graded potentials decrease in strength as they spread, while action potentials maintain their strength.

Question 6

During synaptic transmission at a chemical synapse, which ion's influx triggers neurotransmitter release?

Accepted Answer

Ca$$^{2+}$$

Question 7

Which neurotransmitter is the main excitatory neurotransmitter in the central nervous system?

Accepted Answer

Glutamate

Question 8

An inhibitory postsynaptic potential (IPSP) typically results from the opening of which type of ion channel?

Accepted Answer

Chemically gated Cl$$^-$$ channels

Question 9

Which process is responsible for terminating the effects of neurotransmitters in the synaptic cleft?

Accepted Answer

All of the above

Question 10

Temporal summation in a neuron refers to:

Accepted Answer

A single synapse firing repeatedly in rapid succession

Question 11

Which of the following best explains why the axon initial segment is the most likely site for action potential initiation?

Accepted Answer

It has the highest concentration of voltage-gated sodium channels

Question 12

Which of the following is a function of dendritic spines?

Accepted Answer

They increase the surface area for synaptic input

Question 13

Which of the following would most likely increase synaptic strength during high-frequency stimulation?

Accepted Answer

Increased neurotransmitter release

Question 14

Which of the following is NOT a way to modulate synaptic effectiveness?

Accepted Answer

Increasing myelin thickness

Question 15

A patient is given a drug that blocks the reuptake of serotonin in the brain. What is the expected effect at the synapse?

Accepted Answer

Increased serotonin concentration in the synaptic cleft

Question 16

Which of the following best describes the chemoaffinity hypothesis in neural development?

Accepted Answer

Axons are guided to their targets by specific chemical cues

Question 17

Which of the following is a consequence of synaptic plasticity?

Accepted Answer

Synaptic connections can be modified by activity and experience

Question 18

Which of the following is true about electrical synapses?

Accepted Answer

They allow direct passage of ions through gap junctions

Question 19

If a neuron receives simultaneous EPSPs and IPSPs at different locations, what is the result?

Accepted Answer

The EPSPs and IPSPs are spatially summed, affecting the membrane potential

Question 20

Which of the following best describes the role of the growth cone in neural development?

Accepted Answer

It senses environmental cues and guides axon outgrowth

Neuronal Signaling and Synaptic Transmission: Study Notes for ANP 1105A

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