Question 1

Which structure of the ear is responsible for converting sound waves into mechanical movements?

Accepted Answer

Tympanic membrane

Question 2

What is the primary function of the auditory (eustachian) tube?

Accepted Answer

Equalizes air pressure on both sides of the tympanic membrane

Question 3

Which fluid fills the membranous labyrinth of the inner ear?

Accepted Answer

Endolymph

Question 4

A patient presents with severe ear pain and impaired hearing after a throat infection. Which anatomical feature most likely contributed to the spread of infection to the middle ear?

Accepted Answer

Short and horizontal auditory tube

Question 5

Which of the following best describes the role of the organ of Corti?

Accepted Answer

Contains hair cells that provide the sense of hearing

Question 6

What is the function of cerumen produced by ceruminous glands?

Accepted Answer

Lubricates and waterproofs the canal and tympanic membrane

Question 7

Which part of the inner ear is primarily responsible for detecting rotational movements of the head?

Accepted Answer

Cristae ampullaris in the semicircular ducts

Question 8

The basilar membrane separates which two chambers in the cochlea?

Accepted Answer

Cochlear duct and tympanic duct

Question 9

Which equation best represents the relationship between the speed of sound ($$v$$), frequency ($$f$$), and wavelength ($$\lambda) in $$air?

Accepted Answer

$$v = f 	imes \lambda$$

Question 10

A child with recurrent otitis media undergoes tympanostomy. What is the purpose of this procedure?

Accepted Answer

To drain fluid from the tympanic cavity and relieve pressure

Question 11

Which structure is weighted with otoliths to enhance the sense of gravity and motion?

Accepted Answer

Otolithic membrane

Question 12

What is the correct sequence for the transmission of sound from the external environment to the brain?

Accepted Answer

Auricle → external auditory canal → tympanic membrane → ossicles → cochlea → hair cells → auditory cortex

Question 13

Which of the following is TRUE regarding the fluids in the inner ear?

Accepted Answer

Endolymph fills the membranous labyrinth and perilymph fills the space between the bony and membranous labyrinths

Question 14

Which specialized sensory area is responsible for detecting linear acceleration?

Accepted Answer

Maculae of utricle and saccule

Question 15

If the stapes is immobilized due to infection, which process will be most directly affected?

Accepted Answer

Amplification and conduction of vibrations to the inner ear

Question 16

Which membrane do the stereocilia of hair cells in the organ of Corti contact to initiate the sense of hearing?

Accepted Answer

Tectorial membrane

Question 17

A sudden change in altitude causes discomfort in your ears. Which action helps relieve this discomfort and why?

Accepted Answer

Yawning, because it opens the auditory tube and equalizes pressure

Question 18

Which of the following best explains how the ear distinguishes between different frequencies of sound?

Accepted Answer

Different regions of the basilar membrane vibrate in response to different frequencies

Question 19

Which equation would you use to calculate the pressure amplitude ($$P) of a $$sound wave given its intensity ($$I) $$and the density ($$\rho) $$and speed ($$v) of $$sound in air?

Accepted Answer

$$P = \sqrt{2I\rho v}$$

Question 20

Which of the following is NOT a function of the external ear?

Accepted Answer

Amplifies and conducts sound waves to the inner ear

Special Senses Lecture 2

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