The oropharynx and the laryngopharynx are lined with which type of epithelium?

• A. Simple columnar
• B. Pseudostratified ciliated columnar
• C. Stratified squamous
• D. Transitional

Answer: (C)

Verified step by step guidance

1. Understand the function of the oropharynx and laryngopharynx: These regions of the pharynx are part of the digestive and respiratory systems, and they are exposed to mechanical stress from food passage and air movement.
2. Recall the characteristics of stratified squamous epithelium: This type of epithelium is composed of multiple layers of cells, providing protection against abrasion, pathogens, and chemical damage.
3. Compare the listed epithelial types: Simple columnar epithelium is specialized for absorption and secretion, pseudostratified ciliated columnar epithelium is involved in mucus movement in the respiratory tract, and transitional epithelium is found in areas like the bladder where stretching occurs.
4. Identify why stratified squamous epithelium is suitable: The oropharynx and laryngopharynx require a durable lining to withstand the mechanical stress of food and air passage, which is provided by stratified squamous epithelium.
5. Conclude that stratified squamous epithelium is the correct answer based on its protective function and location in areas subject to mechanical stress.