What is the purpose of using ascending grades of alcohol during dehydration?

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Multiple Choice

What is the purpose of using ascending grades of alcohol during dehydration?

Gradual replacement of water with a dehydrating solvent is the key idea. Using ascending grades of alcohol lets water be removed step by step, so the tissue doesn’t experience osmotic shock or rapid shrinkage. This careful transition helps preserve cell and tissue architecture, reducing shrinkage and distortion as the sample moves toward embedding in paraffin. After dehydration, the tissue can be cleared and infiltrated with paraffin for sectioning. Other options aren’t the goal: dehydration is not done to speed up processing, and fixation occurs earlier in the workflow with chemical fixatives, not during dehydration. Staining happens after sectioning, not during the dehydration step.

Gradual replacement of water with a dehydrating solvent is the key idea. Using ascending grades of alcohol lets water be removed step by step, so the tissue doesn’t experience osmotic shock or rapid shrinkage. This careful transition helps preserve cell and tissue architecture, reducing shrinkage and distortion as the sample moves toward embedding in paraffin. After dehydration, the tissue can be cleared and infiltrated with paraffin for sectioning.

Other options aren’t the goal: dehydration is not done to speed up processing, and fixation occurs earlier in the workflow with chemical fixatives, not during dehydration. Staining happens after sectioning, not during the dehydration step.

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