eyes

Question 1

cornea

Answer 1

Light enters the eye through the cornea and strikes photoreceptors in the retina

Question 2

lens

Answer 2

The lens helps focus light on the retina (accommodation)

Question 3

sclera

Answer 3

The sclera protects the eye and helps to maintain its shape.

Question 4

choroid

Answer 4

The choroid layer contains blood vessels which nourish the retina.

Question 5

rods and cones

Answer 5

The retina is composed of rods (sensitive to light intensity) and cones (sensitive to wavelengths of colour)

Question 6

fovea centralis

Answer 6

The fovea centralis contains a high concentration of cones, while the blind spot (the point at which the optic nerve connects to the retina) contains neither rods nor cones.

Question 7

pupil

Answer 7

Ciliary muscles control the size of the pupil, allowing more/less light to reach the retina

Question 8

iris

Answer 8

The iris controls how much light actually enters the eye through the lens.

Question 9

optic nerve

Answer 9

Photoreceptors relay sensory impulses to the occipital lobe of the brain via the optic nerve