Question

Select the INCORRECT statement with respect to the respiratory system.

• A. The oropharynx is a common passage for food and air.
• B. Larynx contains vocal cords for producing sound.
• C. The trachea is supported by 'C' shaped rings of cartilage.
• D. The trachea is internally lined by simple squamous epithelium.

Hint:

The trachea is lined by ciliated columnar epithelium, while squamous epithelium is found in alveoli.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept
The trachea is a tube kept open by C-shaped cartilage rings. Its lining must trap dust and sweep it upward.

Step 2: Check each statement
The oropharynx is a common passage for food and air, so (A) is true.
The larynx contains the vocal cords that produce sound, so (B) is true.
The trachea is supported by C-shaped cartilage rings, so (C) is true.

Step 3: Find the incorrect one
The trachea is lined by pseudostratified ciliated columnar epithelium with goblet cells. Simple squamous epithelium lines the alveoli, so statement (D) is incorrect.

Final Answer:
The incorrect statement is that the trachea is lined by simple squamous epithelium. \[ \boxed{\text{(D) }\text{The trachea is internally lined by simple squamous epithelium.}} \]