Function of ciliated epithelium is

KGMU 2024

Applied Physiology

Easy

Appeared in: KGMU 2024

Explanation

Ciliated epithelium is characterized by the presence of motile, hair-like projections called cilia on its apical (free) surface.
These cilia beat in a coordinated, rhythmic, wave-like manner to create a current.
This current propels fluid, mucus, or other substances across the epithelial surface.
A primary example is the mucociliary escalator in the respiratory tract, which clears trapped debris and pathogens.
Another key role is in the fallopian tubes, where ciliary action moves the egg toward the uterus.

Option A: Protection from mechanical stress and abrasion is the primary function of stratified squamous epithelium, which consists of multiple layers of cells, unlike the typically single-layered ciliated epithelium.
Option B: Secretion is the main function of glandular epithelium. While ciliated epithelium is often found alongside secretory cells (like goblet cells that produce mucus), the ciliated cells themselves are responsible for movement, not secretion.
Option D: Active immune responses are carried out by specialized cells of the immune system, such as lymphocytes and macrophages. While the mucociliary escalator provides a physical barrier (part of innate immunity), the epithelial cells themselves do not mount an immune response.

Visual 1: Diagram - A cross-section of the tracheal lining, clearly labeling the ciliated columnar cells, the cilia themselves, and the interspersed mucus-producing goblet cells. This helps visualize the components of the mucociliary escalator.
Visual 2: Animation - A short animation demonstrating the metachronal (wave-like) beating of cilia and how this coordinated movement propels a layer of mucus along the epithelial surface.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Function of Ciliated Epithelium as background academic context rather than a clinical decision trigger.
Damage to cilia from smoking is a major clinical issue. Toxins in cigarette smoke paralyze and eventually destroy cilia, impairing the mucociliary escalator and leading to mucus buildup, chronic cough ('smoker's cough'), and a significantly increased risk of respiratory infections like bronchitis and pneumonia.
Primary Ciliary Dyskinesia (PCD) is a group of genetic disorders, including Kartagener's syndrome, where cilia are dysfunctional or immotile. This leads to chronic, recurrent infections of the respiratory tract, infertility (due to immotile sperm flagella and impaired ovum transport), and sometimes situs inversus (reversal of internal organs).
What if a patient stops smoking? Ciliary function can begin to recover within a few weeks to months, reducing coughing and lowering the risk of infection as the mucociliary escalator is gradually restored.

How to Approach the Question

This is a factual recall question testing knowledge of basic histology.
First, identify the key term in the stem: 'ciliated epithelium'.
Recall the defining structural feature of this tissue: the presence of 'cilia'.
Next, recall the function of cilia: they are motile structures that beat to move things.
Scan the options to find the one that describes this movement function. 'Moves mucus and other substances' is a direct match.
Mentally eliminate the other options by associating them with different tissues: Protection (stratified squamous), Secretion (glandular), Immune response (immune cells).

Concept Tested & Keywords

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