The ________ is the flap-like structure that closes off the larynx during swallowing so that food and liquids do not enter the respiratory system when swallowing occurs.

Flap-like Structure

A physical formation resembling a flap, used to describe parts of organisms that can move back and forth or serve as a cover.

Larynx

The hollow muscular organ forming an air passage to the lungs and holding the vocal cords; commonly known as the voice box.