4.4

Question 1

eardrum

Answer 1

flap of skin separating outer and middle ear, vibrates when sound reaches it

Question 2

cochlea

Answer 2

spiral-shaped tube filled with fluid, receptors attached converts hairs’ movement into electrical impulses

Question 3

auditory nerve

Answer 3

electrical impulses travel along nerve to brain, interprets sound

Question 4

ossicles

Answer 4

vibrations from eardrum pass onto the three bones that magnify it

Question 5

eustachian tube

Answer 5

tube that joins the middle ear to nose and throat

Question 6

optic nerve

Answer 6

carries electrical signals from retina to brain

Question 7

retina

Answer 7

cone and rod cells (cells on retina) absorb light rays and turns them into electrical signals

Question 8

fovea centralis

Answer 8

responsible for sharp central focus

Question 9

cone cells

Answer 9

more concentrated in fovea centralis

Question 10

iris

Answer 10

coloured part of the eye

Question 11

pupil

Answer 11

opening in the iris that determines amount of light entering eye

Question 12

rod cells

Answer 12

nerve cells that are sensitive to dim light

Question 13

accommodation

Answer 13

ability of the lens to change shape

Question 14

myopia

Answer 14

more focus on close objects (crosses in the retina)

Question 15

hyperopia

Answer 15

more focused on distant objects, eye ball is too long

Question 16

pinna

Answer 16

outer ear, funnels sound into the ear canal

Question 17

aqueous humour

Answer 17

clear fluid that lies between the cornea and the lens

Question 18

lends

Answer 18

flexible structure that enables light to be focused on retina

Question 19

cornea

Answer 19

bends light into lens