Which of the following structures closes over the trachea to protect it during swallowing? Emergency Care Chapter 5 Which of the following structures closes over the trachea to protect it during swallowing? a.Pharynx b.Epiglottis c.Cricoid cartilage d.Diaphragm Answer: b. Epiglottis Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+