Drug Metabolism Mechanisms Quiz

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Questions and Answers

What is the primary goal of drug metabolism?

  • To increase protein binding
  • To reduce the drug's bioavailability
  • To increase drug solubility
  • To inactivate or detoxify foreign substances (correct)

What happens during Phase 1 metabolism?

  • A binding site is introduced for hydrophilic compounds (correct)
  • The drug is excreted by the kidneys
  • Prodrugs are activated
  • The drug is inactivated by liver enzymes

Which organ is NOT mentioned as a site where drug metabolism takes place?

  • Gut
  • Pancreas (correct)
  • Brain
  • Liver

Which route of drug administration typically results in 100% bioavailability?

<p>Intravenous administration (B)</p> Signup and view all the answers

What is the purpose of the first-pass effect in drug metabolism?

<p>To reduce the degree of inactivation by liver enzymes (D)</p> Signup and view all the answers

What factors influence drug distribution in terms of tissue targets?

<p>All of the above (D)</p> Signup and view all the answers

Which of the following statements about drug metabolism is false?

<p>All metabolites are inactive (B)</p> Signup and view all the answers

What influences a drug's bioavailability?

<p>Liver enzyme inactivation during first pass effect (A)</p> Signup and view all the answers

'Xenobiotic' refers to:

<p>'Foreign substances' (C)</p> Signup and view all the answers

What is the main function of phase 2 metabolism?

<p>To conjugate a water-soluble molecule (A)</p> Signup and view all the answers

What type of enzymes cleave glucuronide conjugates in the gut?

<p>Glucuronidase enzymes (B)</p> Signup and view all the answers

Where are most water-soluble drug metabolites excreted?

<p>By the kidneys (C)</p> Signup and view all the answers

What is pharmacodynamics primarily concerned with?

<p>Drug's mechanism of action (C)</p> Signup and view all the answers

Which type of substance interferes with or inhibits the physiological action of another substance?

<p>Antagonist (C)</p> Signup and view all the answers

What do competitive substances have in common?

<p>They use the same binding site on a receptor (A)</p> Signup and view all the answers

What is an agonist substance known for?

<p>Initiating a physiological response (B)</p> Signup and view all the answers

Allosteric substances interact with receptors in what manner?

<p><strong>Non-competitive</strong> manner (D)</p> Signup and view all the answers

Which factor influences drug absorption by requiring only non-ionized forms of drugs to easily pass through a lipid bilayer?

<p>pH in the stomach (B)</p> Signup and view all the answers

What is the main goal of pharmacology as described in the text?

<p>To understand how drugs interact with biological systems (D)</p> Signup and view all the answers

Which statement accurately describes drug distribution after administration?

<p>Drug distribution is affected by physiologic factors. (A)</p> Signup and view all the answers

How do most drugs get absorbed according to the text?

<p>Passive diffusion (D)</p> Signup and view all the answers

What is the effect of pH on drug absorption in the digestive tract?

<p>Low pH favors absorption for weak acids or bases (B)</p> Signup and view all the answers

Which type of antagonist binds to a different site on the receptor than the agonist?

<p>Allosteric antagonist (D)</p> Signup and view all the answers

What is the role of phase 1 metabolism in drug processing?

<p>It converts lipophilic drugs into more polar compounds (A)</p> Signup and view all the answers

Why is bioavailability an important consideration in pharmacology?

<p>It reflects the proportion of a drug reaching circulation (D)</p> Signup and view all the answers

Which factor influences individual drug responses according to the text?

<p>Tissue permeability and blood flow (D)</p> Signup and view all the answers

What is the purpose of a Therapeutic Index (TI) in pharmacology?

<p>To compare the potency and safety of a drug (D)</p> Signup and view all the answers

What does LD50 stand for in pharmacology?

<p>50% Lethal Dose (D)</p> Signup and view all the answers

Why is it advised to use generic names over brand names when prescribing drugs?

<p>Generic names are more standardized across jurisdictions (A)</p> Signup and view all the answers

What should be included in prescription requirements according to the text?

<p>The refill authorization number and interval between refills (A)</p> Signup and view all the answers

What does ED50 represent in pharmacology?

<p>Effective Dose 50% (A)</p> Signup and view all the answers

What is the relationship between LD50 and ED50 used for in pharmacology?

<p>To assess the safety margin of a drug (A)</p> Signup and view all the answers

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