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How We Maintain Balance

When a person...

Question

When a person rotates rapidly for a sustained period of time it results in the sensation of dizziness and impaired ability to walk steadily. This is because

A

The hair cells of ampulla are damaged

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B

Endolymph comes in contact with tectorial membrane

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C

The horizontal and vertical canals are stimulated

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D

The vestibular branch of the auditory nerve is pressed

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Solution

The correct option is D The vestibular branch of the auditory nerve is pressed
Vestibular apparatus is present in the ear in association with the cochlea. This apparatus is responsible for balance and sense of orientation of the body in the air. This apparatus is connected to the auditory nerve and helps in carrying information about hearing and orientation. When the body is oriented in the different form by rotating the body for certain period of time, the nerve gets disturbed or pressed. This results in a sensation of falling and the person walk in a disoriented manner.
Thus, the correct answer is option D.

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Q. Assertion :Hair cells on the basilar membrane (the organ of Corti) are responsible for hearing. Reason: Pressure waves, which begin at the oval window, cause the basilar membrane to vibrate, so that the cilia of the hair cells touch the tectorial membrane. This causes the hair cells to initiate nerve impulses, which are carried by the auditory nerve to the brain.

Q. Following is a list of the events (in a random order) that lead to the formation of an auditory impulse.
(i) Vibration is transferred from the malleus to the incus to the stapes.
(ii) Basilar membrane moves up and down.
(iii) Nerve impulse is transmitted in cochlear nerve to auditory cortex of brain for impulse analysis and recognitions.
(iv) Sound waves pass through ear canal.
(v) Stereocilia of hair cells of organ of Corti rub against tectorial membrane.
(vi) Sound waves cause ear drum to vibrate.
(vii) Nerve impulse is generated.
(viii) Vibrations move from fluid of vestibular canal to the fluid of tympanic canal.
(viii) Vibrations move from fluid of vestibular canal to the fluid of tympanic canal.
(ix) Membrane at oval window vibrates.
Which of the following options represents these events in a correct order?

Q. 1.The ears are fragile instruments.
A. These impulses travel via the auditory nerve to the brain, where they are interpreted as, say, words, music or an approaching vehicle.
B. When sound waves enter the ear, they cause the eardrum to vibrate.
C. These, in turn, stimulate auditory nerve fibers, each attuned to a different frequency.
D. The vibrations are transmitted to the cochlea, in the inner ear, where fluid carries them to neatly organized rows of hair cells.
6. Damage to this delicate apparatus results from both volume and length of exposure to sound.

Q. Branched ends of nerve cells are called telodendria, which establish the functional contact with other nerve cell. This connection is called

The significance of hair and wax in auditory canal is

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