12 Ears

Question 1

Sound wave

Answer 1

Small fluctuations in air pressure

-vibration

Question 2

1) outer ear

Answer 2

• pinna

* auditory canal

Question 3

Pinna

Answer 3

OUTSIDE ear flap

•skin or cartilage to capture more vibration

Question 4

Auditory canal

Answer 4

Tube 2.5 cm long
•leads to eardrum in middle
•amplifies sound waves
•hairs in canal protect from infections

Question 5

2) Middle ear

Answer 5

•tympanum, ossicles, oval window

Question 6

Tympanum

Answer 6

“Eardrum”
•round elastic structure that vibrates
•amplified vibrations by ossicles

Question 7

Ossicles

Answer 7

3 tiny interconnected bones in middle
•SMALLEST bones in body
- lever for intensity of next bone

Question 8

Oval window

Answer 8

Wall of INNER EAR

•stapes pass vibrations to oval windows

Question 9

Eustachian tube

Answer 9

Connecting tube that links tho at and nose to the ear
•pressure equalizes with air pressure
Ex) air plane

Question 10

3) Inner ear

Answer 10

•semicircular canals, vestibule (balance)
•cochlea (hearing)
-organ of Cortia, basilar, hair cells, tectorial

Question 11

Cochlea

Answer 11

Coiled
HEARING
•mechanical NRG, electrochemical impulses, transmit to brain

Question 12

Organ of Corti

Answer 12

Middle chamber

Organ for hearing

Question 13

Basilar membrane

Answer 13

Base of organ of corti

•hair cells are attached

Question 14

Tectorial membrane

Answer 14

To far end of thin projections called stereocilia (embedded in hair)

Question 15

Hair cells

Answer 15

Distinguish both pitch and intensity of frequency of sound waves

Question 16

Semicircular canals

Answer 16

Balance
•contain mechanoreceptors that detect head and body ROTATION
•rotational equilibrium

Question 17

Gravitational equilibrium

Answer 17

Balance required while moving head FORWARD and backward

•VESTIBULE

Question 18

Otholiths: Saccule and utricle

Answer 18

Calcium carbonate granules

•gravity pulls on them putting pressure to send neural impulses

Question 19

Proprioceptord

Answer 19

Another type of mechanoreceptors for COORDINATION
•muscles tendons and joints
•position of body to brain