Nervous system pt.3

Question 1

name the 3 parts the ear is divided into

Answer 1

Outer ear
middle ear
inner ear

Question 2

function of the pinna? (earlobe)

Answer 2

Collect sound waves and direct them to auditory canal

Question 3

function of auditory canal?

Answer 3

Transmit sound waves to the tympanic membrane

Question 4

what is another word for tympanic membrane?

Answer 4

eardrum

Question 5

what is the tympanic membrane & its function

Answer 5

a thin membrane the separating the outer & middle ear which converts sound waves into vibrations.

Question 6

what are the ossicles and name them

Answer 6

Three tiny bones:
malleuous
incus
stapes

Question 7

what do the ossicles do?

Answer 7

Amplify vibrations from tympanic membrane and transmit vibrations to inner ear

Question 8

what is the purpose of the semi-circular canals

Answer 8

control balance

Question 9

discuss the Cochlea

Answer 9

It is filled with fluid that starts to move due to pressure waves formed from vibrations passed into oval window from the ossicles.

Question 10

Cochlea contains receptors called?

Answer 10

Organ of Corti which generate electrical impulses

Question 11

auditory nerve function

Answer 11

transport impulses from cochlea to the cerebrum to be interpreted as sound.

Question 12

how do we hear?

Answer 12

• pinna directs sound waves into auditory canal
• sound waves cause the tympanic membrane to vibrate
• vibrations will be on to the ossicles (which amplify it)
• vibrations in the ossicles will cause the oval window to vibrate
• this will cause the fluid in the inner ear to move
• this will stimulate the organ of corti which will generate an electrical impulse
• auditory nerve will take the impulse to the cerebrum
• cerebrum interprets the sound

Question 13

discuss deafness

Answer 13

1. wax build up in ear which causes the tympanic membrane to not be able to vibrate.
2. damage done to ossicles (cannot vibrate)
3. cells in Cochlea are damaged (loud sounds)

Question 14

discuss the Tongue

Answer 14

• movable muscular organ
• has taste buds on the surface
• plays a role in chewing and swallowing food
• plays a role in speech

Question 15

what are the 5 basic tastes

Answer 15

bitter
sour
sweet
salt
umami

Question 16

function of the Nose

Answer 16

breathing
plays a role in sense of taste
smell

Question 17

how do we smell?

Answer 17

• oudour molecules dissolve in the mucous glands
• receptors detect stimuli
• convert it to impulse
• brain interprets the impulse as a smell