Which of the following structures in throat is responsible for the prevention of collapse of air-passage in human beings?
Rings of cartilage
The windpipe (trachea) carries air to the lungs and is supported by C-shaped rings of cartilage in its wall. These rigid rings keep the tube held open so that the air-passage does not collapse when the air pressure inside falls during breathing.
The oesophagus is the food pipe and carries no air, the larynx is the voice box that generates sound, and the pharynx is the common passage behind the mouth and nose; none of them supplies the structural support that keeps the airway from collapsing.
Hence, the answer is Rings of cartilage.
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