Q20 of 27 Page 6

What is the function of the trachea? Why do its walls not collapse even when there is less air in it? (CBSE 2010)

Trachea is an 11 cm long and hollow tube that opens into laryngopharynx through its opening called "glottis).

The inner wall of Trachea contains Mucus glands and cilia, this Mucus keeps the lumen of Trachea moist and cilia pushes the Mucus and dust away from lungs.


b) Trachea has" C-shaped" cartilaginous rings on its outer wall. These rings are 16-18 in number and prevent the collapsing of the Trachea when there is less air in it.

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(a) Name the blood vessel that brings deoxygenated blood to the human heart.

(b) Which chamber of the human heart receives deoxygenated blood?


(c) Describe how deoxygenated blood from this chamber is sent to lungs for oxygenation. (CBSE 2010,2008)