Impedance Transformer

Question 0

The middle ear helps to amplify sounds at which frequencies

Answer 0

Lower frequencies

Question 1

At what frequencies does the human outer ear help to amplify sound

Answer 1

Higher frequencies

2800 Hz resonant frequency of outer ear system

Question 2

Three main functions of the middle ear are

Answer 2

Pressure equalization
Impedance matching
Inner ear protection

Question 3

The two primary mechanisms of the middle ear impedance transformer are related to

Answer 3

Difference of surface area between TM and oval window (17x)

Malleus is larger than stapes so you get leverage at the smaller end

Question 4

If the muscles of the middle ear protect the inner ear why then can noise induced hearing loss occur

Answer 4

Stapedius muscle
Tensor Tympani

Less effective for higher frequencies
Reflex is not instantaneous