Which statement best describes the purpose of a cryostat in histology?

• A. It maintains frozen temperatures to cut frozen tissue sections.
• B. It heats tissue to improve cutting.
• C. It dries sections before staining.
• D. It stains sections directly.

Answer: (A)

The key idea is that freezing is essential for cryosectioning. A cryostat is a refrigerated microtome housed in a cooled chamber with a chilled blade, so the tissue stays solid while you cut very thin sections. This frozen state preserves the tissue’s structure long enough to produce crisp, uniform slices (usually a few micrometers thick) for rapid staining and evaluation. Because the tissue must remain frozen to cut cleanly, heating would melt it, drying would distort morphology, and staining is performed after the sections are mounted, not inside the cryostat.