Q.Some epithelia are pseudo-stratified. What does this mean?
You're viewing a preview — the full solution, concept, methods & PYQ mapping are locked.
Start your 14-day free trial to unlock the full solution →'Pseudostratified' literally means 'falsely layered' — the epithelium is truly a single cell layer, but varying cell heights and nucleus positions make it look like it has multiple layers when viewed in cross-section.
In a genuinely stratified epithelium, there are multiple distinct layers of cells stacked on top of each other, with only the bottom-most layer touching the basement membrane. In contrast, in a pseudostratified epithelium, every single cell does reach and rest on the basement membrane — it is fundamentally a simple (one-layer) epithelium. However, not all the cells are the same height or shape: some are tall and reach the free (luminal) surface, while others are shorter and don't reach the top. Because the nuclei of these differently-sized cells end up positioned at different levels within the tissue, a vertical section through the tissue shows nuclei scattered at multiple heights, creating the illusion of several cell layers stacked on each other — hence 'pseudo' (false) stratified.
…
Unlock everything free for 14 days
- Full step-by-step solutions
- Concept-first explanations
- Methods, shortcuts & mistakes
- PYQ mapping + timed mock tests
Full access for 14 days. No credit card required.