Eyes + Ears

Question 1

Suggest a benefit for animals to have two eyes

Answer 1

provides 3D vision, better judgement of distance + wider range of vision

Question 2

Conjunctiva

Answer 2

mucus membrane that coats the eye providing luberication and protections

Question 3

Cornea

Answer 3

Transparent layer in the front of the eye that allows light to enter the eye

Question 4

sclera

Answer 4

White of eye.gives the eye shape, no light can pass through

Question 5

Aqueous humour

Answer 5

saline solution to nourish eye, provides shape to eye

Question 6

Iris

Answer 6

coloured part of eye. controls the amount of light that enters the eye

Question 7

Pupil

Answer 7

black hole in the cente of the eye that allows light in

Question 8

Lens

Answer 8

focuses light on the back of the eye by changing shape

Question 9

Cillary Muscles

Answer 9

contract and relax to change the shape of the lens

Question 10

Choroid

Answer 10

A thin muscle layer containing blood vessles to norish the eye and melanin to prevent reflection of light within the eye

Question 11

Retina

Answer 11

contains phototsensitive cells in the eye (rods and coned)

Question 12

describe rods

Answer 12

detect black and white light
work in low light
all over retina
numerous

Question 13

decribe cones

Answer 13

detech coloured light
work in bright light
mostly found at fovea
less numerous

Question 14

foveva

Answer 14

contains cones only, point of sharpest vision

Question 15

blind spot

Answer 15

location where the optic nerve leaves brain, no rods or cones

Question 16

optic nerve

Answer 16

carry electrical messages from eye to brain (cerebrum)

Question 17

Viterous humour

Answer 17

more visous fluid to nourish back of eye. provides the eye with shape.

Question 18

Name the three components of the ear

Answer 18

air filled outer ear
air filled middle ear
fluid filled inner ear

Question 19

Name the functions of the ear

Answer 19

hearing and balance

Question 20

Pinna

Answer 20

composed of cartilage.collect and funnle sound waves in the ear.

Question 21

Auditory canal

Answer 21

carries vibrarions to the eardrum. wax is secreted outside the ardrum to trp dirt and pathogens

Question 22

eardrum

Answer 22

thin membrane that seperates the outer ear from the middle ear. transfers sound waves to middle ear

Question 23

ear bones (ossicles)

Answer 23

three tin bones (hammer, anvil,stirrup)
amplify and carry sound waves from eardrum to oval windoww

Question 24

Oval window

Answer 24

transfers soundwaves to inner ear

Question 24

eustachian tube

Answer 24

connects middle ear to phaerynx in throat.keeps air pressure equal on both sides of the eardrum

Question 25

Cochlea

Answer 25

fluid filles tube involved in hearing.converts soundwaves into nerve impluses.transported to the cerebrum component of the brains

Question 26

semicircular canals

Answer 26

responsible for balance,there are three semicircular canals to control balance in all directions.

Question 27

Describe a ear defect

Answer 27

Glue ear.
Pain in ear,loss of earing
causes: infection causing a sticky substance to fill middle ear and ossicles cannot vibrate.
treated with grommits
prevention; balanced diet to promote immune system