The body structure that provides a route by which infections organisms can enter the middle ear to cause otitis media is the
A)nasopharynx.
B)eustachian tube.
C)tympanic membrane.
D)sinus cavity.

Question

Quizplus · Accepted Answer

A)The eustachian tube connects the middle ear with the nasopharynx, and this tube provides a route through which infectious organisms can enter the middle ear from the nose and throat. The nasopharynx and sinus cavity are structures in the nose and throat. They do not directly connect to the middle ear. The tympanic membrane separates the middle ear from the external auditory canal. It protects the middle ear from infectious organisms when it is intact.
B)The eustachian tube connects the middle ear with the nasopharynx, and this tube provides a route through which infectious organisms can enter the middle ear from the nose and throat. The nasopharynx and sinus cavity are structures in the nose and throat. They do not directly connect to the middle ear. The tympanic membrane separates the middle ear from the external auditory canal. It protects the middle ear from infectious organisms when it is intact.
C)The eustachian tube connects the middle ear with the nasopharynx, and this tube provides a route through which infectious organisms can enter the middle ear from the nose and throat. The nasopharynx and sinus cavity are structures in the nose and throat. They do not directly connect to the middle ear. The tympanic membrane separates the middle ear from the external auditory canal. It protects the middle ear from infectious organisms when it is intact.
D)The eustachian tube connects the middle ear with the nasopharynx, and this tube provides a route through which infectious organisms can enter the middle ear from the nose and throat. The nasopharynx and sinus cavity are structures in the nose and throat. They do not directly connect to the middle ear. The tympanic membrane separates the middle ear from the external auditory canal. It protects the middle ear from infectious organisms when it is intact.

The Body Structure That Provides a Route by Which Infections