This question-specific review guide is tied to the answer reasoning for a PracticeTestVault item. Use it after you answer the question so the review stays focused on what the prompt actually tested.
What this question is testing
Objective: Fixation
Prompt focus: A histotechnologist receives a large fatty specimen for processing. Which factor most directly determines how well a 10 percent neutral buffered formalin fixative will penetrate the tissue?
Why the correct answer works
The thickness of the tissue section placed in fixative
Thinner tissue sections allow formalin to penetrate fully, while thick blocks remain underfixed in the center.
Why the tempting wrong answer fails
The tempting wrong answer usually loses because it skips the key condition, priority, or evidence in the prompt.
Plain-language takeaway
Formalin penetrates tissue slowly, roughly one millimeter per hour, so thick specimens fix poorly in the center. Grossing tissue into thin sections allows the fixative to reach the interior and produce uniform fixation.
Simple analogy
Think of fixation like following a short checklist: identify the clue, confirm the rule, and then make the move that fits this exact scenario.
How to review it before a retake
- Underline the command word and name what the question is asking before rereading the choices.
- Compare the correct answer against the closest distractor and write the exact detail that separates them.
- Retest this objective with a fresh question without looking at the rationale first.