Colorectal Drug Delivery Quiz

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Questions and Answers

What is the main reason why conventional drug delivery systems for treating colon disorders are failing?

  • The colon lacks well-defined villi, reducing the absorption surface area.
  • The drugs don't reach the site of action in appropriate concentration. (correct)
  • The colon has a lower absorption capacity than the small intestine.
  • Ingested materials remain in the colon for a much longer time.

What is the advantage of sustained colonic release of drugs?

  • It can be useful in the treatment of nocturnal asthma.
  • It can be useful in the treatment of angina.
  • It can be useful in the treatment of arthritis.
  • All of the above (correct)

What is the main reason why local treatment of colonic pathologies is more effective with the delivery of drugs to the affected area?

  • The colon has a lower absorption capacity than the small intestine.
  • Ingested materials remain in the colon for a much longer time.
  • The drugs can directly target the affected area in the colon. (correct)
  • The colon lacks well-defined villi, reducing the absorption surface area.

Which of the following colonic pathologies can benefit from local drug delivery to the affected area?

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

What is the main reason why the colon has a lower absorption capacity than the small intestine?

<p>The colon mucosa lacks well-defined villi as found in the small intestine. (C)</p> Signup and view all the answers

What is the main reason why ingested materials remain in the colon for a much longer time?

<p>The colon has a lower absorption capacity than the small intestine. (D)</p> Signup and view all the answers

How does the coupling of drug carrier nano-systems to ligands differ from direct coupling of drugs to targeting ligands?

<p>Coupling to ligands allows for the import of thousands of drug molecules per receptor targeted ligand (C)</p> Signup and view all the answers

What is the primary benefit of nanoparticle formulations that can provide sustained-release profiles up to 24 hours?

<p>Improved patient compliance with drug regimens (A)</p> Signup and view all the answers

What is the primary purpose of using drug delivery devices?

<p>To provide sustained-release of the medication (C)</p> Signup and view all the answers

What is one of the favorable absorption sites for subcutaneous implantation of drug delivery devices?

<p>The body tissue (D)</p> Signup and view all the answers

What is a key requirement for the materials used in drug delivery device implants?

<p>The materials must be biocompatible (A)</p> Signup and view all the answers

What is a potential advantage of subcutaneous implantation of drug delivery devices?

<p>The ability to remove the device at any time (C)</p> Signup and view all the answers

What is the texture of the skin that the text describes as being similar to a cat's tongue or sharkskin?

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

What is the purpose of the solid silicon needles or hollow metal needles described in the text?

<p>To penetrate the horny layer without breaking and without stimulating nerves in the deeper tissues (D)</p> Signup and view all the answers

What is the purpose of the liposomes described in the text?

<p>To entrap and deliver drugs to and through the skin (B)</p> Signup and view all the answers

What property of liposomes can be modified to enhance their circulation time in the bloodstream?

<p>Attaching polyethylene glycol (PEG) units to the bilayer (D)</p> Signup and view all the answers

What is the purpose of conjugating liposomes to antibodies or ligands?

<p>To enhance target-specific drug therapy (B)</p> Signup and view all the answers

Why can dissolved hydrophilic solutes not readily pass through the lipid membrane of a liposome?

<p>The liposome encapsulates a region of aqueous solution inside the hydrophobic membrane (A)</p> Signup and view all the answers

What is a key property that the enhancer should not cause upon removal of allergenic material?

<p>Loss of body fluids (B)</p> Signup and view all the answers

Which statement accurately reflects the importance of hydration in skin penetration?

<p>Hydration increases the penetration rate by opening the compact layer of the horny layer. (B)</p> Signup and view all the answers

What enhances skin bioavailability among the listed options?

<p>Transdermal films (B)</p> Signup and view all the answers

What effect does the formation of lipophilic ion pairs have on drug permeability?

<p>Decreases permeability (A)</p> Signup and view all the answers

Which property is essential for a chemical to be considered a good solvent for drugs?

<p>Ability to dissolve drugs effectively (A)</p> Signup and view all the answers

Why is it important for an enhancer to be cosmetically acceptable?

<p>'Feel' of skin should be good (B)</p> Signup and view all the answers

What is the purpose of the implantable biosensor drug delivery system?

<p>To control the release of medication (B)</p> Signup and view all the answers

Which component signals the battery in the implantable biosensor drug delivery system?

<p>Sensor (A)</p> Signup and view all the answers

What role does telemetry play in the implantable biosensor drug delivery system?

<p>Enabling physician/patient regulation of drug release (A)</p> Signup and view all the answers

What distinguishes microfluidics as formulating devices?

<p>Precision in handling nano-liter and pico-liter volumes of liquid (D)</p> Signup and view all the answers

How does the implantable biosensor drug delivery system respond when a sufficient amount of medication has been released?

<p>The polymer valves close, covering the perforations (B)</p> Signup and view all the answers

What does the battery do when the sensor detects a chemical change in the implantable biosensor drug delivery system?

<p>Emits an electrical charge (B)</p> Signup and view all the answers

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