Tag: ear and its function

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Questions Related to ear and its function

Multiple choice biology sensory organs of humans - sense organs ear : the organ of hearing and equilibrium ear and its function ear

Static balance is maintained by

  1. Maculae

  2. Cristae

  3. Organ of Corti

  4. Reissner's membrane
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Macula is a projecting ridge of saccule and utricle which are otolith organs in vestibular apparatus of inner ear. Vestibular apparatus controls equilibrium and maintains balance of body. When the head changes position due to movements, otoliths in gelatinous membrane come in contact with sensory hair cells and impulses are generated. The impulses are carried by the auditory nerves for interpretation in cerebellum which then sends signal and static balance is restored.
So, the correct answer is 'Maculae'.
Multiple choice biology sensory organs of humans - sense organs ear : the organ of hearing and equilibrium ear and its function ear

Statoreceptors are located in

  1. Cristae

  2. Maculae

  3. Both A and B

  4. Cochlea
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Statoreceptors are the receptors that sense changes in equilibrium and orientation of body. They are located in Cristae and Maculae. Crista is a projecting ridge of ampulla which is the swollen base of bony canal in inner ear. Macula is a projecting ridge of saccule and utricle which are otolith organs in vestibular apparatus of inner ear. Crista and macula are specific receptors of vestibular apparatus that are responsible for maintaining balance of body and posture.
So, the correct answer is 'Both A and B'.
Multiple choice biology sensory organs of humans - sense organs ear : the organ of hearing and equilibrium ear and its function ear

Part of ear concerned with hearing is

  1. Reissner's membrane and tectorial membrane

  2. Basilar membrane and tectorial membrane

  3. Reissner's membrane and basilar membrane

  4. Ampulla
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Basilar membrane is the floor of cochlear duct and separates scala tympani and scala media. It bears organ of Corti which is the organ of hearing and considered as body's microphone. The internal side of organ of Corti has rows of sensory hair cells which are receptors for sound waves. Above the hair cells is present a thin and elastic membrane called tectorial membrane. The hair cells bend and are pressed against the tectorial membrane due to vibrations in the basilar membrane. This results in generation of impulses which are sent to brain and sound is recognized.
So, the correct answer is 'Basilar membrane and tectorial membrane'.
Multiple choice biology sensory organs of humans - sense organs ear : the organ of hearing and equilibrium ear and its function ear

The sense of equilibrium is determined by

  1. Basilar membrane of cochlea

  2. Tectorial membrane of cochlea

  3. Sensory crista of ampulla

  4. Sensory cells of organ of Corti
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Ampulla is the enlargement of one end of semi-circular canal. It is the swollen base of semi-circular canals which are three semi-circular and interconnected tubes present in inner ear. These are a part of bony labyrinth. They contain a fluid called endolymph. Ampulla contains a projecting ridge called crista ampullaris. It contains hair cells which are sensory receptors present in organ of Corti and have cytoplasmic projections on the apical end called stereocilia. Crista contains specific receptors that sense movements in body and maintain dynamic equilibrium.
So, the correct answer is 'Sensory crista of ampulla'.
Multiple choice biology sensory organs of humans - sense organs ear : the organ of hearing and equilibrium ear and its function ear

Sound is transmitted from middle ear to internal ear due to

  1. Vibrations of tympanum

  2. Vibrations of stapes

  3. Striking of stapes

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Middle ear has three ear ossicles, malleus, incus and stapes. Sound waves enter the external ear and are directed to ear drum and cause vibrations in the ear drum. The ear drum transmits vibrations to the ear ossicle malleus which transfers vibration further to incus and finally to stapes. Stapes strike against the oval window in back and forth direction and transmits the vibrations to cochlear fluid of inner ear through oval window. 
So, the correct answer is 'Striking of stapes'.
Multiple choice biology sensory organs of humans - sense organs ear : the organ of hearing and equilibrium ear and its function ear

Receptor cells for balancing occur in human ear in

  1. Malleus, incus and stapes

  2. Utriculus, sacculus and semicircular canals

  3. Organ of Corti

  4. Eustachian tube
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
In humans, balance is maintained by vestibular apparatus in inner ear which contain specific receptors called crista and macula. Crista is a projecting ridge of ampulla of semi-circular canals. Macula is a projecting ridge of saccule and utricle (or sacculus and utriculus) which are otolith organs in vestibular apparatus.
So, the correct answer is 'Utriculus, sacculus and semicircular canals'.
Multiple choice biology sensory organs of humans - sense organs ear : the organ of hearing and equilibrium ear and its function ear

Pressure is maintained on two sides of ear drum by

  1. Auditory ossicles

  2. Membranous labyrinth

  3. Eustachian tube

  4. Cochlea
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Eustachian tube connects middle ear with the pharynx. It maintains pressure between middle ear and atmosphere and thus, equalizes pressure on two sides of ear drum. Eustachian tube is closed for most of the time and opens during certain activities like chewing, swallowing so that the air can pass between middle ear and pharynx. When there is a change in atmospheric pressure, a sudden feeling of blockage is observed and these activities can lead to opening of eustachian tube so that the pressure can be equalized within the middle ear.
So, the correct answer is 'Eustachian tube'. 
Multiple choice biology sensory organs of humans - sense organs ear : the organ of hearing and equilibrium ear and its function ear

Correct sequence of regions in organisation of auditory mechanoreceptor organ is

  1. Pinna - Tympanic membrane - Auditory canal - Cochlea - Malleus - Incus - Stapes - Auditory nerve

  2. Pinna - Malleus - Incus - Stapes - Auditory canal - Tympanic membrane - Cochlea - Auditory nerve

  3. Pinna - Auditory canal - Tympanic membrane - Malleus - Incus - Stapes - Cochlea - Auditory nerve

  4. Pinna - Cochlea - Tympanic membrane - Auditory membrane - Auditory canal - Incus - Malleus - Stapes - Cochlea - Auditory nerve

  5. Pinna - Tympanic membrane - Auditory canal - Incus - Malleus - Stapes - Cochlea - Auditory nerve.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

  • The outermost part of human ear is called pinna (external ear).
  • Pinna is followed by auditory canal. It is a tube by which pinna is connected to middle ear.
  • The auditory canal extends from pinna to tympanic membrane (ear drum).
  • Tympanic membrane is followed by three ear ossicles, malleus, incus and stapes.
  • Stapes is attached to oval window of cochlea and transfers the vibrations to the fluid of cochlea. Cochlea is a part of inner ear.
  • Inner ear contains vestibular apparatus and auditory nerve along with cochlea.
So, the correct answer is 'Pinna - Auditory canal - Tympanic membrane - Malleus - Incus - Stapes - Cochlea - Auditory nerve'.

Multiple choice biology sensory organs of humans - sense organs ear : the organ of hearing and equilibrium ear and its function ear

Specific receptors responsible for the balance of the body and posture are __________.

  1. Organ and Corti

  2. Crista and macula

  3. Basilar membrane

  4. Tectorial membrane
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Crista is a projecting ridge of ampulla which is the swollen base of bony canal in inner ear. Macula is a projecting ridge of saccule and utricle which are otolith organs in vestibular apparatus of inner ear. Crista and macula are specific receptors of vestibular apparatus that are responsible for maintaining balance of body and posture.
So, the correct answer is 'Crista and macula'.