Question

The trachea is lined with incomplete rings of
a. Fibrous cartilage
b. Calcified cartilage
c. Elastic cartilage
d. Hyaline cartilage

Answer 1

Hint: The trachea is the cartilaginous tube, which connects the larynx with the lungs, it is also called a windpipe, it is mainly useful for the passage of air. A trachea wall is made up of C shaped incomplete, cartilaginous rings, which prevents the collapse of the trachea during breathing.

Complete answer:
- The trachea extends from the larynx to the primary bronchi.
- At the top of the trachea, there is a cartilage called cricoid cartilage.
- The trachea is made up of horse-shaped rings, which are joined together by the ligaments and tracheal muscles.
- The epiglottis is the structure which closes the opening of the larynx while swallowing, and prevents the entry of food to the larynx.
- The adult trachea is about 1.5 to 2 cm, in diameter.
- The length of the trachea is 10 to 11 centimeters.
- The trachea is wider in males than females, which begins at the bottom of the larynx and ends at the point of the carina, carina is a point where the larynx is divided into left and right bronchi.
- It extends from the sixth cervical vertebrae,(C6) to the thoracic vertebrae, which means up to T4.
- This trachea is surrounded by 10 to 20 cartilaginous rings which are made up of hyaline cartilage.
- Each ring is 4mm in high, and it is an incomplete and c shaped ring.

Hence, the correct answer is option (D).

Note: The trachea consists of hyaline cartilage, and most of these cartilaginous rings are partially connected or C shaped, and one or two rings are completely connected, and as the age increases, the cartilage may calcify. And their normal function is to prevent collapse while breathing.