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.
glorospand
The thyroid gland is located anterior to the trachea. The parathyroid glands are located within the thyroid gland.
swallows migrate for one month.
The epiglottis is the tissue that covers the trachea during swallowing to prevent food from entering the airway.
All of the neck muscles except the cricothyroid muscle.
When food is swallowed, the epiglottis covers the trachea. During inspiration, the epiglottis allows air to pass into the trachea.
Actually, the pharynx is not a piece of cartilage, but a muscular tube that connects the nose and mouth to the esophagus and trachea. It plays a key role in swallowing by helping to direct food and liquids to the esophagus while preventing them from entering the trachea. The epiglottis is a flap of cartilage that covers the entrance to the trachea during swallowing to prevent food or liquids from entering the airway.