the eye

Question 1

rods

Answer 1

receptor cells that are sensitive to light

Question 2

cones

Answer 2

receptor cells that can detect colour

Question 3

iris

Answer 3

controls how much light enters the pupil

Question 4

cornea

Answer 4

transparent lens that refracts light as it enters the eye

Question 5

lens

Answer 5

transparent disc that can change shape to focus light onto the retina

Question 6

retina

Answer 6

contains light receptor cells – rods (detect light intensity) and cones (detect colour)

Question 7

optic nerve

Answer 7

sensory neuron that carries impulses between the eye and the brain

Question 8

pupil

Answer 8

hole that allows light to enter the eye

Question 9

conjunctivita

Answer 9

a clear membrane that covers the white of the eye and the inside of the eyelids; it lubricates the eye and provides protection from external irritants

Question 10

ciliary muscle

Answer 10

a ring of muscle that contracts and relaxes to change the shape of the lens

Question 11

suspensory ligaments

Answer 11

ligaments that connect the ciliary muscle to the lens

Question 12

fovea

Answer 12

a region of the retina with the highest density of cones (colour detecting cells) where the eye sees particularly good detail

Question 13

blind spot

Answer 13

the point at which the optic nerve leaves the eye, where there are no receptor cells

Question 14

sclera

Answer 14

the strong outer wall of the eyeball that helps to keep the eye in shape and provides a place of attachment for the muscles that move the eye