Quiz: Inner Ear Function and Sensory Perception — 9 perguntas

1. What are otoliths and maculae in the context of the inner ear?

A. Otoliths are nerve fibers transmitting signals from the cochlea, and maculae are the bones that protect the inner ear structures.

B. Otoliths are the gelatinous layers overlying hair cells in the cochlear duct, and maculae are the auditory nerve fibers that carry signals to the brain.

C. Otoliths are sensory hair cells within the maculae that detect angular acceleration, and maculae are the fluid-filled chambers in the semicircular canals.

D. Otoliths are calcium carbonate crystals embedded in the otolithic membrane of sensory epithelia called maculae, which detect linear acceleration and static head position.

Answer: (D)

Explicação

Otoliths are calcium carbonate crystals embedded in the otolithic membrane of the maculae, which are sensory epithelia in the utricle and saccule responsible for detecting linear acceleration and static head position.

2. What is the primary function of otoliths in the inner ear?

A. Detecting sound vibrations in the cochlea

B. Transducing mechanical stimuli into nerve signals during head movements

C. Detecting linear acceleration and static head position relative to gravity

D. Filtering high-frequency sounds to the auditory cortex

Answer: (C)

Explicação

Otoliths are calcium carbonate crystals embedded in the otolithic membrane that help detect linear accelerations and head position relative to gravity, not sound vibrations or filtering sounds.

3. Which structure within the cochlear duct is responsible for transducing sound vibrations into neural signals?

A. Spiral organ (organ of Corti)

B. Endolymph

C. Basilar membrane

D. Tectorial membrane

Answer: (A)

Explicação

The spiral organ, also known as the organ of Corti, is the sensory organ within the cochlear duct that contains hair cells which transduce mechanical vibrations caused by sound waves into neural signals for hearing.

4. Which structures are responsible for detecting static head position and linear acceleration?

A. Semicircular canals

B. Otoliths and maculae

C. Basilar membrane and cochlear duct

D. Spiral organ (Organ of Corti)

Answer: (B)

Explicação

Otoliths and maculae function together to detect static head positions and linear accelerations, whereas semicircular canals detect rotational movements.

5. What is the primary role of the cochlear duct in the auditory system?

A. To amplify sound vibrations before they reach the eardrum

B. To convert sound vibrations into nerve signals for hearing

C. To protect the inner ear from loud noises

D. To detect linear acceleration and head position

Answer: (B)

Explicação

The cochlear duct contains the spiral organ (organ of Corti), which is responsible for converting sound vibrations into neural signals that are interpreted as sound by the brain, making its primary role the transduction of mechanical vibrations into nerve impulses.

6. In which part of the inner ear are the maculae located?

A. Semicircular canals

B. Cochlea

C. Utricle and saccule

D. Tympanic membrane

Answer: (C)

Explicação

The maculae are located within the utricle and saccule, which are parts of the otolith organs responsible for detecting linear acceleration and head position.

7. What role do stereocilia play on hair cells in the inner ear?

A. They transmit nerve signals directly to the brain.

B. They bend in response to mechanical stimuli, triggering nerve impulses.

C. They amplify sound vibrations in the cochlear duct.

D. They produce the calcium carbonate otoliths.

Answer: (B)

Explicação

Stereocilia bend when stimulated by mechanical forces such as head movements, causing hair cells to send nerve impulses; they do not transmit signals directly or produce otoliths.

8. Why do otoliths cause the otolithic membrane to respond to gravity?

A. They are elastic and buffer mechanical shock.

B. They increase the density of the membrane, making it responsive to gravity.

C. They contain nerve fibers that send signals to the vestibular nerve.

D. They generate electrical fields that detect acceleration.

Answer: (B)

Explicação

Otoliths increase the density of the otolithic membrane, allowing it to respond to gravity and linear movements effectively.

9. Which of the following best describes the difference between the utricle and saccule?

A. The utricle detects vertical movement; the saccule detects horizontal movement.

B. The utricle detects horizontal movement; the saccule detects vertical movement.

C. Both detect only rotational movements.

D. Both are involved in auditory processing.

Answer: (B)

Explicação

The utricle's macula is oriented horizontally to detect horizontal linear acceleration, while the saccule's macula is oriented vertically to detect vertical acceleration.