Hearing

Question 1

What are the three section of the ear?

Answer 1

Outer, middle and inner.

Question 2

What does the outer ear consist of?

Answer 2

Earflap or Pinna

Question 3

What does the eustachian tube connect?

Answer 3

Connects middle ear and the nose.

Question 4

What is the role of the eustachian tube?

Answer 4

It equalizes air pressure on both sides of the ear drum. At high altitudes you can feel this when your ears pop, so the oscicles can vibrate freely.

Question 5

A blocked eustachian tube can result in?

Answer 5

A blocked eustachian tube can result in barotrauma. Eustachian tubes regulates the pressure in the middle ear by releasing air from the middle ear during ascent, and by allowing air into the middle ear during descent.

When blocked the pressure differential can’t be regulated by the eustachian tube causing pain and barotrauma.

Question 6

Barotrauma is defined as?

Answer 6

Tissue damage

Question 7

What and where are the smallest bones in the human body?

Answer 7

The smallest bone in the human body are the three ossicles of the middle ear

Question 8

What are the names for the three ossicles?

Answer 8

They are named for their shape: the hammer (malleus), anvil (incus), and stirrup (stapes)

Question 9

What energy do the ossicles use?

Answer 9

Mechanical energy.

Question 10

What does the middle ear consist of?

Answer 10

Is an air-filled section between the eardrum, the oval window of cochlea and the ossicles

Question 11

What does the cochlea do?

Answer 11

converts the mechanical vibrations arriving vis ossicle into nerve signals (or electric energy) that are sent to the brain to be interpreted as sounds.

Question 12

What are the two types of hearing loss?

Answer 12

• Conductive loss

* Non-conductive loss

Question 13

What are some reasons for conductive loss to occur?

Answer 13

• Wax
• Infection
• Allergies

Question 14

Problems to which parts of the ear causes conductive loss?

Answer 14

Conductive loss is hearing loss caused by outer and middle ear problems (this consists of the outer canal, ear drum and the ossicles).

Question 15

Is conductive loss reversible?

Answer 15

Yes

Question 16

What is non-conductive loss?

Answer 16

Is hearing loss caused by inner ear problems.

Question 17

Is non-conductive hearing loss reversible?

Answer 17

Mostly non-reversible

Question 18

What some common factors between NiHL and Presbycusis.

Answer 18

Common Factor in both NIHL and Presbycusis is high pitch (frequencies) loss first

Question 19

Causes of NIHL?

Answer 19

• Constant exposure to hazardous noise environment

- Sudden explosive noise

Question 20

What is the typical noise level of a light aircraft?

Answer 20

Roughly 90-110dB

Question 21

What is temporary threshold shift (TTS)

Answer 21

Temporary Threshold Shift (TTS) is the temporary (i.e. less than 48 hours) decrease in hearing

Question 22

What is permanent threshold shift?

Answer 22

Permanent Threshold shift is the term used to describe noise damage that lasts longer than 48 hours.

Question 23

What is frequency of the noise pitch measured in?

Answer 23

Frequency of the noise pitch is measured in Hertz (Hz)

Question 24

What is the intensity of loudness measured in?

Answer 24

Intensity of loudness measured in decibels (dB)

Question 25

What is the Hz of a normal conversation?

Answer 25

Normal conversation occurs around 3000Hz

Question 26

What is the normal range of dB in a healthy ear?

Answer 26

Range of normal is between -10dB and +25dB

Question 27

Good noise headsets reduce level by about?

Answer 27

40dB on average.

Question 28

How does the headset reduce the noise?

Answer 28

Headset knows the frequency and counteracts during noise cancellation process.