Question 1

Which of the following best describes the mechanism by which acetylcholine (ACh) is removed from the synaptic cleft after it is released at the neuromuscular junction?

Accepted Answer

It is broken down by acetylcholinesterase (AChE) into acetic acid and choline, which are then taken back into the neuron.

Question 2

A patient is prescribed a drug that blocks postsynaptic dopamine receptors. This treatment is most likely intended for which psychiatric disorder?

Accepted Answer

Schizophrenia

Question 3

Which neurotransmitter is synthesized from the amino acid tryptophan and is a common target in the treatment of depression?

Accepted Answer

Serotonin

Question 4

A drug that inhibits the reuptake of serotonin would most likely have which of the following effects?

Accepted Answer

Increase the duration of serotonin action at the synapse

Question 5

Which of the following neurotransmitters is most important for producing inhibitory postsynaptic potentials (IPSPs) in the brain by opening ligand-gated chloride ion channels?

Accepted Answer

Gamma (\gamma)-Aminobutyric Acid (GABA)

Question 6

A patient presents with inappropriate fear responses and is prescribed a medication that enhances GABA activity. Which disorder is this medication most likely intended to treat?

Accepted Answer

Anxiety disorder

Question 7

Which neurotransmitter is synthesized from tyrosine and is used by the autonomic nervous system (ANS) to influence heart rate, blood pressure, and digestion?

Accepted Answer

Norepinephrine (Noradrenalin)

Question 8

Which of the following best explains why antihistamines can cause drowsiness as a side effect?

Accepted Answer

They block histamine receptors in the CNS, which are involved in arousal and attention.

Question 9

Which neurotransmitter is most widely used as an excitatory neurotransmitter in the brain and typically leads to the opening of sodium or calcium ion channels?

Accepted Answer

Glutamate

Question 10

A patient with bipolar disorder is prescribed a medication that blocks sodium ion channels to decrease the generation of action potentials. What is the physiological effect of this treatment?

Accepted Answer

It decreases neuronal excitability by preventing depolarization.

Question 11

Which of the following best describes a converging neural circuit?

Accepted Answer

Multiple input neurons synapse onto a single postsynaptic neuron, integrating information from various sources.

Question 12

Which neuropeptide is released from type C sensory afferent fibers and is involved in transmitting pain and temperature sensations?

Accepted Answer

Substance P

Question 13

A patient is experiencing symptoms of depression. Which combination of neurotransmitter deficiencies is most likely implicated in this disorder?

Accepted Answer

Serotonin, norepinephrine, and dopamine

Question 14

Which of the following best describes the function of opioids such as endorphins, enkephalins, and dynorphins in the nervous system?

Accepted Answer

They elicit pain relief and act as nervous system depressants.

Question 15

Which neurotransmitter is most widely used as an inhibitory neurotransmitter in the spinal cord?

Accepted Answer

Glycine

Question 16

A patient is given a drug that blocks the reuptake of dopamine. What is the expected effect on synaptic transmission?

Accepted Answer

Increased dopamine concentration and prolonged action at the postsynaptic membrane

Question 17

Which of the following best explains why a single neuron can influence multiple parts of the brain and/or body in a diverging circuit?

Accepted Answer

The axon of the input neuron branches to make contacts with multiple postsynaptic neurons, which then branch further.

Question 18

Which neurotransmitter is most directly involved in the regulation of feeding behavior and the sensation of hunger or satiety?

Accepted Answer

Neuropeptide Y

Question 19

Which of the following is a correct statement about the relationship between neurotransmitter structure and function?

Accepted Answer

A neurotransmitter can have both excitatory and inhibitory effects depending on the receptor type.

Major Neurotransmitters: Structure, Function, and Clinical Relevance - 11.5

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