Q: Which equation correctly represents the relationship between sound intensity in decibels (dB) and sound energy?

$$dB = 10 \times \log_{10} \left( \frac{I}{I_0$} \right)$$

Question 1

Which structure in the ear is primarily responsible for transmitting sound vibrations from the tympanic membrane to the oval window?

Accepted Answer

Ossicles (malleus, incus, stapes)

Question 2

A patient experiences difficulty equalizing ear pressure during airplane travel. Which anatomical structure is most likely involved in this process?

Accepted Answer

Pharyngotympanic (Eustachian) tube

Question 3

The basilar membrane is narrow and stiff near the oval window and becomes wider and more flexible toward the cochlear apex. Which frequency of sound is most likely to activate hair cells near the base of the cochlea?

Accepted Answer

High-frequency sounds (e.g., 20,000 Hz)

Question 4

Which fluid fills the membranous labyrinth and is similar in composition to intracellular fluid (ICF)?

Accepted Answer

Endolymph

Question 5

What is the primary function of the maculae located in the utricle and saccule?

Accepted Answer

Monitoring static equilibrium and linear acceleration

Question 6

During sound transduction, what happens when the stereocilia of inner hair cells bend toward the tallest stereocilium?

Accepted Answer

Mechanically gated cation channels open, leading to depolarization

Question 7

Which equation correctly represents the relationship between sound intensity in decibels (dB) and sound energy?

Accepted Answer

$$dB = 10 	imes \log_{10} \left( \frac{I}{I_0$} ight)$$

Question 8

A person is exposed to a sound of 90 dB for a prolonged period. What is the most likely consequence?

Accepted Answer

Increased risk of hearing loss due to damage to hair cells

Question 9

Which part of the auditory pathway is responsible for localizing the source of a sound?

Accepted Answer

Superior olivary nuclei

Question 10

If the endolymph in the semicircular canals moves due to head rotation, which structure detects this movement?

Accepted Answer

Crista ampullaris in the ampulla

Question 11

Which of the following best describes the role of outer hair cells in the cochlea?

Accepted Answer

They amplify the motion of the basilar membrane and protect inner hair cells

Question 12

A patient has damage to the vestibular branch of the vestibulocochlear nerve. Which symptom would most likely be present?

Accepted Answer

Impaired balance and equilibrium

Question 13

Which of the following correctly matches the equilibrium receptor with the type of movement it detects?

Accepted Answer

Crista ampullaris – angular (rotational) acceleration

Question 14

Which process occurs when the otolithic membrane slides over the hair cells in the maculae during head movement?

Accepted Answer

Depolarization or hyperpolarization of vestibular nerve fibers, altering action potential frequency

Question 15

Which of the following best explains why only sounds within the human hearing range are transmitted through the cochlear duct?

Accepted Answer

The basilar membrane only vibrates in response to frequencies between 20 and 20,000 Hz

Question 16

Which equation correctly relates the frequency ($$f) $$and wavelength ($$\lambda) of a $$sound wave to its speed ($$v$$)?

Accepted Answer

$$v = f 	imes \lambda$$

Question 17

A person tilts their head forward, causing the hairs in the macula of the utricle to bend toward the kinocilium. What is the immediate effect on the vestibular nerve fibers?

Accepted Answer

Depolarization and increased action potential frequency

Question 18

Which of the following is true regarding the transmission of sound from the external environment to the inner ear?

Accepted Answer

Sound waves cause the tympanic membrane to vibrate, which is transmitted via ossicles to the oval window

Question 19

Which structure is responsible for allowing the two perilymph-containing chambers in the cochlea to be continuous?

Accepted Answer

Helicotrema

Question 20

If a person spins rapidly in a chair and then stops, which structure in the inner ear is primarily responsible for the sensation of continued movement?

Accepted Answer

Crista ampullaris in the semicircular canals

Hearing and Balance: Anatomy and Physiology of the Ear

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