Final answer:
The levels that completely close the larynx from the pharynx are the soft palate and uvula, the larynx, and the pharyngeal constrictor muscles.
Step-by-step explanation:
The three levels that completely close the larynx from the pharynx during swallowing are:
- The soft palate and uvula rise reflexively to close off the entrance to the nasopharynx.
- The larynx is pulled superiorly and the cartilaginous epiglottis folds inferiorly, covering the glottis (the opening to the larynx).
- The pharyngeal constrictor muscles contract to move the food bolus through the oropharynx and laryngopharynx.