topic 14 *3

Question 1

lense

Answer 1

transparent rounded structure which refracts light, focusing to retina

Question 2

pupil

Answer 2

hole in iris which light can pass through into the eye from cornea to Lense

Question 3

iris

Answer 3

coloured part, controls amount of light let in

Question 4

cornea

Answer 4

transparent outer layer, refracts light and focuses it to retina

Question 5

retina

Answer 5

contains light receptor cells

Question 6

blind spot

Answer 6

near optic nerve- where it meets retina, no receptor cells, no sensitivity to light

Question 7

optic nerve

Answer 7

neurones which carry nerve impulses from retina to brain

Question 8

low light intensity

Answer 8

radial muscles contract
circular muscles relax
pupil increases

Question 9

high light intensity

Answer 9

radial muscles relax
circular muscles contract
pupil decreases

Question 10

rods

Answer 10

sensitive to light, in sides of retina, more rods when dark, so a larger pupil

Question 11

cones

Answer 11

and cones- found in fovea, colour vision, red, blue, green)