<em>The structure that holds the air passages open in the trachea (windpipe) is </em><u><em>the hyaline cartilage</em></u><em> in the tracheal wall offering support and keeping the trachea drom collapsing. </em>
Explanation:
<em>The bronchi are divided in two by the level of the fifth thoracic vertebra the gaps that keeps the bronchus open are the cartilages filled with the trachealis muscle, that holds open the lumen of the trachea and bronchis and allow the flexibility necessary for the respiration motion (inspiration and expiration). </em>
<h2><em>The trachea connects the larynx to the bronchi and allows air to pass through the neck and into the thorax. The rings of cartilage making up the trachea allow it to remain open to air at all times</em></h2>
It is what makes to where you are a warm enough temperature that's not to hot and not to cold. It tells all the cells in that one part of your body what to do keep it balanced. If you don't understand this just comment on my answer and say what you need to tell me so I know what to adjust so you can understand it.
