Tissue Fixation: Key Methods for Preparation
Fixation is the crucial first step in preparing biological tissues for microscopic examination. Its primary goal is to preserve the tissue's structure and chemical constituents as close to their living state as possible, preventing autolysis (self-digestion) and putrefaction (decay).
Evaluating Fixation Techniques
Let's analyze the options provided in the context of tissue fixation:
- Stirring/Agitation: While gentle agitation can sometimes aid the penetration of the fixative into the tissue, it is a mechanical process secondary to the chemical or physical fixation method itself. It doesn't define the fixation process.
- Staining: Staining is a technique used after fixation (and usually other processing steps like dehydration and embedding) to add color to cellular components, making them visible under a microscope. It is not part of the fixation process.
- Hardening: Fixation causes chemical or physical changes within the tissue. For example, chemical fixatives like formalin cross-link proteins, and physical fixatives like alcohol precipitate proteins. These actions result in the tissue becoming firmer or 'hardened'. This hardening is essential as it stabilizes the tissue structure, prevents distortion during subsequent handling (like sectioning), and makes the tissue easier to cut into thin slices for microscopy. Therefore, hardening is a key characteristic and intended outcome of the fixation process that enables further preparation.
Among the given options, hardening represents the most significant outcome directly related to the effectiveness of the fixation process in preparing tissues for further study.
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Choose the correct answer from the options given below :
Important Questions from Mixed Topic (CUET PG)
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A. Berlin Wall is constructed
B. Communist China joins the UN
C. Soviet invasion of Czechoslovakia
D. Berlin Blockade
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A. Politics is rooted in permanent and unchanging human nature which is basically self centred, self-regarding and self-interested
B. Politics is an autonomous sphere of action and cannot therefore be reduced to morals
C. International Politics is an arena of conflicting self-interests
D. The ethics of international relations is situational ethics which is very different from private morality
Choose the correct answer from the options given below:Who among the following political thinkers consider the anarchical self help system to be a compelling factor for States to maximise their relative power positions?
