Which structure connects the nasal cavity to the throat?

The structure that connects the nasal cavity to the throat is the nasopharynx. This part of the pharynx is located behind the nasal cavity and above the oropharynx. It serves as a passageway for air, allowing it to flow from the nasal cavity into the throat, where it can then proceed to the lungs.

The nasopharynx also plays a role in the respiratory system by helping to filter and humidify the air we breathe. Additionally, it is involved in the function of the Eustachian tubes, which connect the nasopharynx to the middle ear to help equalize air pressure.

The other options, while related to the pharynx, do not connect the nasal cavity directly to the throat. The oropharynx is the section of the pharynx located behind the oral cavity; the laryngopharynx is located below the oropharynx and connects to the larynx and esophagus; the Eustachian tube is actually a canal that leads from the nasopharynx to the middle ear, not a connecting structure for the nasal cavity and throat.