Oxygen is dissolved through spiracles on the outside of insects' bodies into the tracheae.
If you're talking about larger animals such as mammals, then Epiglottis.
It's a "flap" that covers either the trachea or esophagus. It prevents you from choking. When you eat, it covers the trachea so food will go down the esophagus and not the windpipe (trachea). If food gets down your trachea, you will choke.
trachea
epiglottis
The epiglottis protects the trachea from food.
The epiglottis covers the opening to the trachea when swallowing - thereby preventing food/drink entering the trachea and lungs.
The structure that prevents food and liquids from being inhaled when a person swallows is the epiglottis. This flap-like cartilage covers the entrance to the trachea during swallowing, directing food and liquids into the esophagus instead. This mechanism helps prevent aspiration and ensures that the airway remains clear during the swallowing process.
The thyroid gland is located anterior to the trachea. The parathyroid glands are located within the thyroid gland.
glorospand
swallows migrate for one month.
The epiglottis is the tissue that covers the trachea during swallowing to prevent food from entering the airway.
The epiglottis. The epiglottis is a flap of flexible cartilage above the larynx, or voice box. It closes when you swallow, preventing food, water, or saliva from going down the trachea into the lungs.
When food is swallowed, the epiglottis covers the trachea. During inspiration, the epiglottis allows air to pass into the trachea.