During the swallowing reflex during the swallowing reflex the tongue closes the pharynx breathing rate increases the epiglottis closes the glottis the esophageal sphincter closes the esophagus

I believe that during swallowing the epiglottis closes the glottis. Epiglottis is a leaf-shaped cartilage located behind the tongue, at the top of the larynx, whose main function is to seal off the windpipe during eating, so as to prevent accidental inhalation of food. It is only during the process of swallowing that the epiglottis moves and performs this vital function. 

Active site is where they touch.

It's either -limiting factors or -scarce resources but i'd go with my first answer since the food and water are abundant they really aren't scarce