Q: Which of the following equations correctly represents the calculation of bioavailability ($$F) of a $$drug given the area under the curve (AUC) for oral and IV administration?

$$F = \frac{AUC_{oral}}{AUC_{IV}} \times 100\%$$

Question 1

Which of the following statements best describes the concept of 'first pass metabolism' in pharmacokinetics?

Accepted Answer

It refers to the process by which a drug is metabolized by the liver before it reaches systemic circulation, reducing its bioavailability.

Question 2

A patient is given a drug that acts as a competitive antagonist at a neurotransmitter receptor. Which of the following best describes how this drug works?

Accepted Answer

It competes with the neurotransmitter for the same binding site, preventing the neurotransmitter from activating the receptor.

Question 3

Which neurotransmitter is primarily involved in motor regulation and pleasure/reinforcement pathways, and is synthesized from the amino acid tyrosine?

Accepted Answer

Dopamine

Question 4

A drug is administered intravenously (IV) and another is given orally. Which statement about their absorption and bioavailability is most accurate?

Accepted Answer

The IV drug has 100% bioavailability, while the oral drug may have reduced bioavailability due to first pass metabolism.

Question 5

Which of the following equations correctly represents the calculation of drug half-life ($$t_{1/2}) $$given the elimination rate constant ($$k$$)?

Accepted Answer

$$t_{1/2} = \frac{0.693}{k}$$

Question 6

Which of the following best explains why acetylcholinesterase inhibitors are used in the treatment of Alzheimer's disease?

Accepted Answer

They prevent the breakdown of acetylcholine, increasing its levels and enhancing cholinergic transmission.

Question 7

A patient with Parkinson's disease is prescribed L-Dopa. What is the rationale for using L-Dopa instead of dopamine directly?

Accepted Answer

L-Dopa can cross the blood-brain barrier, whereas dopamine cannot.

Question 8

Which of the following is a correct description of the difference between nicotinic and muscarinic acetylcholine receptors?

Accepted Answer

Nicotinic receptors are ionotropic and mediate fast synaptic transmission, while muscarinic receptors are metabotropic and mediate slower, modulatory effects.

Question 9

Which of the following drugs acts as a dopamine agonist and is known to induce psychotic symptoms resembling schizophrenia?

Accepted Answer

Methamphetamine

Question 10

A patient is given a drug that blocks dopamine reuptake (DAT inhibition). Which effect is most likely to occur?

Accepted Answer

Increased dopamine signaling and potential for abuse due to elevated dopamine in the synaptic cleft.

Question 11

Which of the following statements about the blood-brain barrier (BBB) is correct?

Accepted Answer

It restricts the entry of many drugs into the brain, allowing only those with specific properties or transport mechanisms to cross.

Question 12

Which of the following is a plausible reason why identical twins have a higher concordance rate for schizophrenia compared to fraternal twins?

Accepted Answer

Identical twins share 100% of their genetic material, increasing the likelihood of both developing schizophrenia if one is affected.

Question 13

Which of the following equations correctly represents the calculation of bioavailability ($$F) of a $$drug given the area under the curve (AUC) for oral and IV administration?

Accepted Answer

$$F = \frac{AUC_{oral}}{AUC_{IV}} 	imes 100\%$$

Question 14

Which of the following best describes the action of noncompetitive antagonists at neurotransmitter receptors?

Accepted Answer

They bind to an allosteric site on the receptor, interfering with receptor activation even if the neurotransmitter is present.

Question 15

Which of the following is a direct effect of acetylcholine (ACh) at the neuromuscular junction?

Accepted Answer

Excitatory stimulation of skeletal muscle contraction.

Question 16

A patient is exposed to botulinum toxin. What is the primary mechanism by which this toxin affects the nervous system?

Accepted Answer

It blocks acetylcholine release at neuromuscular junctions, causing muscle paralysis.

Question 17

Which of the following statements about dopamine pathways is correct?

Accepted Answer

The mesolimbic pathway is involved in pleasure and reinforcement, projecting from the ventral tegmental area (VTA) to the nucleus accumbens.

Question 18

Which of the following drugs is used as an antipsychotic by blocking D2 dopamine receptors?

Accepted Answer

Haloperidol

Neurotransmitters, Pharmacokinetics, and Dopamine: Study Notes for Psychology

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