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Parts of the External Ear

Of the follow...

Question

Of the following statements, which is true regarding the eustachian tube

A

it equalizes pressure on both sides of the eardrum

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B

it is filled with a fluid called endolymph

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C

it is concerned with equilibrium and balance

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D

it is where sound waves are directed through to the cochlea

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Solution

The correct option is B it equalizes pressure on both sides of the eardrum
The eustachian tube is a canal that connects the middle ear to the nasopharynx, which consists of the upper throat and the back of the nasal cavity. It controls the pressure within the middle ear, making it equal with the air pressure outside the body.

So, the correct answer is 'it equalizes pressure on both sides of the eardrum'.

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Similar questions

Consider the following statements.

i) Ears help our brain to sense from which directions the sounds are coming.

ii) Eustachian tubes equalize the air pressure on either side of the eardrum.

When a sound wave enters the ear, it sets the eardrum into oscillation, which in turn causes oscillation of 3 tiny bones in the middle ear called ossicles. This oscillation is finally transmitted to the fluid filled in inner portion of the ear termed as inner ear, the motion of the fluid disturbs hair calls within the inner ear which transmit nerve impulses to the brain with information that a sound is present. The three bones present in the middle ear are named as hammer, anvil and stirrup. Out of these the stirrup is the smallest one and this only connects the middle ear to inner ear as shown in the figure below. The area of stirrup and its extent of connection with the inner ear limits the sensitivity of the human ear. Consider a person's eat whose moving part of the eardrum has an area of about 43 mm

^{2}

and the area of stirrup is about 3.2 mm

^{2}

. The mass of ossicles is negligible. As a result, force exerted by sound wave in air on eardrum and ossicles is same as the force exerted by ossicles on the inner ear. Consider a sound wave having maximum pressure fluctuation of

3 \times 10^{- 2}

Pa from its normal equilibrium pressure value which is wqual to

10^{5}

Pa. Frequency of sound wave is 1200 Hz.
Data: Velocity of sound wave in air is 332 m/s. Velocity of sound wave in fluid (present in inner ear) is 1500 m/s. Bulk modulus of air is

1.42 \times 10^{5}

Pa. Bulk modulus of fluid is

2.18 \times 10^{9}

Find the pressure amplitude of given sound wave in the fluid of inner ear.

Which of the following statements is/are correct?

1. With respect to a tangent both the circles lie on the same side, this tangent is called direct common tangent.

2. With respect to a tangent both the circles lie on the opposite side, this tangent is called transverse (indirect) common tangent.

Q. Fill in the following blanks with suitable words.
(a) Sound waves are caused by ____________.
(b) A sound wave consists of places of higher pressure called ____________ and places of lower pressure called ____________.
(c) Wave speed in meters per second equals frequency in ____________ multiplied by ____________ in ____________.
(d) Sound cannot travel through ____________.
(e) The sound travels ____________ in a solid than in a gas.
(f) When the frequency of the sound is increased, the wavelength ____________.

Q. Fill in the blanks :
The region in a sound wave, with higher pressure and density, is called ________ and that with low pressure and density, is called ________.

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Parts of the External Ear

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