What closes the wind-pipe during swallowing?

The epiglottis plays a crucial role in the swallowing process by ensuring that food and liquids do not enter the windpipe (trachea). When swallowing occurs, the epiglottis acts like a flap that folds down over the entrance of the trachea. This action effectively prevents food and liquids from traveling down into the lungs, directing them instead into the esophagus.

The action of the epiglottis is vital for protecting the respiratory tract during swallowing. It is an involuntary response that happens automatically to safeguard the airway. Understanding this mechanism is essential, especially in contexts related to anatomy and physiology, as it highlights how the body prevents aspiration and protects respiratory function.

The other options, while related to the throat and swallowing, do not specifically close the windpipe. The vocal cords, for example, allow airflow and produce sound. The uvula and soft palate assist with functions related to speech and the swallowing process but do not serve the primary function of guarding the windpipe during the act of swallowing.