Question

The number of tracheal rings in man are
A)16-20
B)20-24
C)24-28
D)28-32

Answer 1

The trachea is observed as the cartilaginous tube, which attaches the larynx with the lungs, it is also termed as a windpipe, it is mainly useful for the passage of air. A trachea wall is composed of C shaped incomplete, cartilaginous rings, which prevents the collapse of the trachea at the time of breathing.

Complete answer:
1)The trachea positions from the larynx to the primary bronchi.
2)At the top of the trachea, there is a cartilage that is termed as cricoid cartilage.
3)The trachea is composed of horse-shaped rings, which are connected together by the ligaments and tracheal muscles.
4)The epiglottis is referred to as the structure which closes the opening of the larynx while swallowing, and prevents the entry of food to the larynx.
5)The adult trachea is measured to be about 1.5 to 2 cm, in diameter.
6)The length of the trachea is measured out 10 to 11 centimetres.
7)The trachea is wider, meaning it has more diameter 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.
8)It begins from the sixth cervical vertebrae, ($\mathop C\nolimits_6$) to the thoracic vertebrae, which means up to $\mathop T\nolimits_4$.
9)This trachea is enclosed by 10 to 20 cartilaginous rings which are composed of hyaline cartilage.
10)Each ring is 4mm in height, and it is an incomplete and c shaped ring.

Hence, the correct answer is option (A)

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