Eye

Question 1

Cornea

Answer 1

Cause all light to refract into the eye. It is transparent and curved to help bend light.

Question 2

Iris

Answer 2

Coloured part of eye, muscles (circular and radial) can change size (making pupil bigger/smaller)

Question 3

Optic Nerve

Answer 3

bundle of sensory neurons that carry impulses to the brain

Question 3

Lens

Answer 3

Focus light into retina and refracts it.
Can be fat or thing, depending on ciliary muscles and suspensory ligaments.

Question 4

sclera

Answer 4

outside layer of eye

Question 5

Choroid

Answer 5

Black and stops internal reflection of light, has all blood vessels which supply eye with blood

Question 6

Retina

Answer 6

Detects light and has two light sensitive cells, rods and cones

Question 6

What do the rod and cone cells do?

Answer 6

Rod cells detect black and white and help with night vision.

Cone cells are used for colour.

Question 7

Iris in bright light

Answer 7

Circular muscles contract
Radial muscles relax
-> makes pupil smaller so not much light can enter

Question 8

Iris in dim light

Answer 8

Circular muscles relax
Radial muscles contract
-> makes pupil bigger so more light can enter

Question 9

Lens focusing on close objects

Answer 9

Ciliary muscles contract
Suspensory ligaments relax
-> making the lens fatter

Question 10

Lens focusing on distant objects

Answer 10

Ciliary muscles relax
Suspensory ligaments contract
->makes lens thinner