Question

question 41 (mandatory) (2 points)
listen
the main function of the middle ear is:
increase the amplitude of sound in order for the inner ear to function
conduct vibrations of sound from the outer to the inner ear
interpret sounds as they enter the ear
helps in maintaining balance
question 42 (mandatory) (2 points)
listen
a patient vision is recorded as 20/30 using the snellen eye chart. what does this
the patient can read from 30 feet what a person with normal vision can read
from
the patient can read the chart from 20 feet in the left eye and 30 feet in the
right
at 30 feet the patient can read the entire chart.
the patient can read at 20 feet what a person with normal vision can read at 30

Explanation:

• Question 41: The middle ear contains the ossicles (malleus, incus, stapes). Sound waves cause the eardrum (tympanic membrane) to vibrate, which then vibrates the ossicles. The ossicles conduct these vibrations to the inner ear (cochlea). The inner ear is where sound is interpreted (not the middle ear), the inner ear (semicircular canals etc.) helps with balance, and the middle - ear amplifies sound but the key function is conduction.
• Question 42: The Snellen eye chart notation \(20/x\) (where \(x\) is a number). The first number (\(20\)) is the distance (in feet) at which the patient stands. The second number (\(x\)) is the distance at which a person with normal vision can read the same line. So \(20/30\) means the patient at \(20\) feet can read what a person with normal vision can read at \(30\) feet.

Answer:

• Question 41: Conduct vibrations of sound from the outer to the inner ear
• Question 42: The patient can read at 20 feet what a person with normal vision can read at 30