**Question:** Epithelial lining of glottis/ true vocal cords: March 2013 (c)

**Core Concept:** The glottis, also known as the true vocal cords, is a crucial part of the human larynx. The epithelial lining of these structures plays a significant role in their function and health.

**Correct Answer: D (c)**

**Why the Correct Answer is Right:**
The correct answer (option D) refers to the pseudostratified ciliated columnar epithelium as the epithelial lining of the glottis and true vocal cords. This type of epithelium is specific to the respiratory tract and plays a vital role in the respiratory system's defense mechanisms.

**Why Each Wrong Option is Incorrect:**
A. Squamous epithelium (option A): This type of epithelium is typically found in the skin, not the respiratory tract.
B. Stratified squamous epithelium (option B): This type is found in the skin and oral cavity, not the respiratory tract.
C. Cuboidal epithelium (option C): This type is typically found in ducts and tubes, not the respiratory tract.

**Clinical Pearl:**
The pseudostratified ciliated columnar epithelium's key features are cilia, microvilli, and mucus-producing goblet cells that work together to protect the respiratory tract from inhaled particles and pathogens.

**Why Each Wrong Option is Incorrect:**
A. Squamous epithelium is found in the skin and oral cavity, not the respiratory tract.
B. Stratified squamous epithelium is found in the skin and oral cavity, not the respiratory tract.
C. Cuboidal epithelium is found in ducts and tubes, not the respiratory tract.

**Correct Answer Explanation:**
The correct answer (option D) refers to the pseudostratified ciliated columnar epithelium, which is specific to the respiratory tract. This type of epithelium is responsible for the respiratory tract's defense mechanisms, including the clearance of inhaled particles and pathogens through the coordinated movement of cilia, the presence of microvilli, and mucus production by goblet cells.