Question 1

Which of the following best describes the role of acetylcholine (ACh) at neuromuscular junctions?

Accepted Answer

ACh is released by motor neurons and binds to receptors on skeletal muscle, causing excitation and muscle contraction.

Question 2

What is the primary function of myelin sheath in axonal conduction?

Accepted Answer

To prevent leakage of charge and enable rapid, saltatory conduction between nodes of Ranvier.

Question 3

Which neurotransmitter is most abundant in the body and is rapidly degraded by acetylcholinesterase after binding to its receptor?

Accepted Answer

Acetylcholine (ACh)

Question 4

A patient is experiencing rhythmic, repetitive movements such as arm-swinging while walking. Which neuronal pool circuit is most likely responsible for this activity?

Accepted Answer

Reverberating (oscillating) circuit

Question 5

Which of the following best explains why action potentials travel faster in larger diameter axons?

Accepted Answer

Larger diameter axons have lower resistance and provide a larger pathway for current flow.

Question 6

Which process describes the summation of multiple excitatory postsynaptic potentials (EPSPs) arriving at a postsynaptic neuron from different presynaptic neurons at the same time?

Accepted Answer

Spatial summation

Question 7

What is the effect of inhibitory neurotransmitters on the postsynaptic membrane?

Accepted Answer

They induce hyperpolarization by increasing permeability to potassium and chloride ions, making the membrane potential more negative.

Question 8

Which type of synapse is specialized for the release and reception of chemical neurotransmitters?

Accepted Answer

Chemical synapse

Question 9

A single presynaptic neuron fires rapidly, releasing neurotransmitter in quick succession and causing a greater depolarization in the postsynaptic neuron. What is this process called?

Accepted Answer

Temporal summation

Question 10

Which of the following neurotransmitters is classified as an amino acid and is found only in the central nervous system?

Accepted Answer

Gamma aminobutyric acid (GABA)

Question 11

What is the main difference between ionotropic and metabotropic neurotransmitters?

Accepted Answer

Ionotropic neurotransmitters mediate rapid responses by directly changing membrane potential, while metabotropic neurotransmitters promote longer-lasting effects via intracellular signaling.

Question 12

Which neuronal pool circuit is most likely involved in amplifying a signal so that one incoming fiber activates hundreds of motor neurons in the spinal cord?

Accepted Answer

Diverging circuit

Question 13

After neurotransmitter release, which mechanism is responsible for quickly removing the neurotransmitter from the synaptic cleft?

Accepted Answer

Enzymatic degradation or reuptake into the presynaptic axon

Question 14

Which of the following best describes the effect of excitatory postsynaptic potentials (EPSPs) on the postsynaptic membrane?

Accepted Answer

EPSPs are graded depolarizations that increase the likelihood of reaching threshold for an action potential.

Question 15

Which neurotransmitter is excitatory at neuromuscular junctions with skeletal muscle but inhibitory when released on cardiac muscle?

Accepted Answer

Acetylcholine (ACh)

Question 16

A patient is given morphine for pain relief. Morphine acts by binding to the same receptors as which class of neurotransmitters?

Accepted Answer

Peptides (natural opiates)

Question 17

Which of the following equations best represents the change in membrane potential during hyperpolarization induced by inhibitory neurotransmitters?

Accepted Answer

$$V_{m} = -70\ \mathrm{mV} \rightarrow -90\ \mathrm{mV}$$

Question 18

Which type of neuronal pool circuit is most likely involved in problem solving and mental processing, such as mathematics?

Accepted Answer

Parallel after-discharge circuit

Question 19

Which of the following is TRUE regarding the propagation of action potentials in myelinated axons?

Accepted Answer

Action potentials jump from one node of Ranvier to the next, a process called saltatory conduction.

Question 20

Which of the following best describes the function of biogenic amine neurotransmitters in the brain?

Accepted Answer

They play a role in emotional behavior and regulation of the biological clock.

Synaptic Transmission, Neurotransmitters, and Neural Integration in the Nervous System

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