Autolysis and Tissue Examination Quiz
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Questions and Answers

What is the process known as when tissues are digested and broken down by their own enzymes?

  • Autolysis (correct)
  • Oxidation
  • Hydrolysis
  • Hemolysis
  • Which type of tissues experience a more severe autolysis due to being rich in enzymes?

  • Muscle tissues
  • Liver, brain, and kidney tissues (correct)
  • Elastic and collagen tissues
  • Bone tissues
  • Why is autolysis retarded by cold?

  • Cold accelerates enzyme activity
  • Cold prevents tissue breakdown
  • Cold inhibits enzyme activity (correct)
  • Cold has no effect on autolysis
  • What is the advantage of examining fresh tissues over preserved tissues?

    <p>Allows observation of living protoplasmic activities</p> Signup and view all the answers

    Why are preserved tissues preferred for a more effective study as opposed to fresh tissues?

    <p>Allows long-term storage and re-examination</p> Signup and view all the answers

    Why are liver, brain, and kidney tissues more prone to rapid autolysis compared to elastic and collagen tissues?

    <p>Rich in enzymes</p> Signup and view all the answers

    Which method uses microwave radiation to accelerate the fixation process?

    <p>Microwave Fixation</p> Signup and view all the answers

    What is the purpose of permeabilization with 0.5% Triton X-100?

    <p>Enhancing membrane permeability</p> Signup and view all the answers

    Which fixation method involves fixing tissue in a solution containing paraformaldehyde and methanol?

    <p>Paraformaldehyde-methanol fixation</p> Signup and view all the answers

    What is the purpose of decalcification in tissue processing?

    <p>Removing calcium deposits</p> Signup and view all the answers

    What should be optimized for consistent results in microwave fixation?

    <p>Microwave parameters</p> Signup and view all the answers

    What is the primary step after the fixation process with tissues according to the text?

    <p>Processing</p> Signup and view all the answers

    What is the purpose of decalcification in tissue processing?

    <p>To remove calcium or lime salts from tissues</p> Signup and view all the answers

    When should decalcification be performed in the tissue processing workflow?

    <p>After fixation and before impregnation</p> Signup and view all the answers

    What is a consequence of inadequate decalcification in tissue processing?

    <p>Poor cutting of hard tissues</p> Signup and view all the answers

    Which factor does NOT influence the rate of decalcification?

    <p>Time of day</p> Signup and view all the answers

    What is the purpose of surface decalcification in tissue processing?

    <p>To deal with small unexpected deposits of calcium in paraffin blocks</p> Signup and view all the answers

    Which type of decalcifying agents are based on chelating agents?

    <p>Those composed of chelating agents themselves</p> Signup and view all the answers

    What may be experienced when sectioning a paraffin-embedded block with small foci of calcification on the tissue surface?

    <p>Resistance or a 'grating' sensation</p> Signup and view all the answers

    What is recommended for unduly hard tissues that may damage microtome knives?

    <p>Usage of tissue softeners</p> Signup and view all the answers

    Which substance can act as both a decalcifying agent and a tissue softener?

    <p>Perenyi's fluid</p> Signup and view all the answers

    How long should selected portions of unduly hard tissues be left in Perenyi's fluid to facilitate softening?

    <p>12-24 hours</p> Signup and view all the answers

    What effect does immersion in 4% aqueous phenol solution have on fixed tissues?

    <p>Causes tissue softening and easier sectioning</p> Signup and view all the answers

    What impact does submerging the cut surface of a block in Perenyi's fluid have before sectioning?

    <p>Facilitates easier cutting of tissues</p> Signup and view all the answers

    What is the process by which impregnated tissue is placed into a mold containing a medium that solidifies?

    <p>Embedding</p> Signup and view all the answers

    Which of the following is NOT an ideal characteristic of an infiltrating and embedding medium?

    <p>Colored</p> Signup and view all the answers

    What is the general term for the medium used to infiltrate the tissue after impregnation?

    <p>Embedding Medium</p> Signup and view all the answers

    Which of the following is NOT one of the four types of impregnation and embedding medium mentioned in the text?

    <p>Starch</p> Signup and view all the answers

    If the embedding medium is too soft for the tissue material, what issue may occur during sectioning?

    <p>Sections will be torn or shredded</p> Signup and view all the answers

    Why is it important for the embedding medium to match the tissue type in strength and hardness?

    <p>To avoid tearing or shredding of sections</p> Signup and view all the answers

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