The Human Ear Flashcards
Where does the OUTER ear terminate?
The eardrum
What is the function of the OUTER ear?
To protect ear drum from foreign objects and extreme temperatures
What is the function of the ear drum?
To protect middle ear and vibrate to the hammer / anvil & stirrup
How is the middle ear pressure equalised?
Via the Eustachian tube
What is the function of the cochlea?
To interpret vibrations as sound
Where does the stirrup connect to the cochlea?
The oval window
Vestibular system
What is the function of the semi circular canals?
To interpret turning or rolling
Vestibular system
What is the function of the utricle and saccule? (The otolith organ)
To interpret linear accelerations (up and down)
Hearing protection should be worn if ambient noise levels require shouting a conversation from how far away? A.10m B. 5m C. 3m D. Half a metre
D. Half a metre
Deterioration of hearing usually occurs first in which frequency range?
High frequency above normal speech
Does a decibel (dB) unit measure frequency/pitch or intensity/loudness of sound?
Intensity/loudness
Does a hertz (Hz) unit measure frequency/pitch or intensity/loudness of sound?
Frequency/pitch
What is the threshold dB that results in pain to the ears?
140dB
Which component of inner ear senses changes in speed with constant linear acceleration?
A. Semicircular canal
B. Otolith organ
C. Eardrum
D. The cochlea
B. Otolith organ
During CONSTANT angular acceleration, the cupula in the semicircular canals are likely to be
A. Upright
B. Tilted in opposite direction of turn
C. Tilted in same direction of turn
D. Oscillating
A. Upright
