Co-ordination And Control

Question 1

Aqueous humour

Answer 1

Watery fluid that keeps the front of the eye at the right pressure. Allows light to pass through.

Question 2

Vitreous humour

Answer 2

Jelly-like substance between lens and retina and keeps eye spherical. Allows light rays to pass through.

Question 3

Conjunctiva

Answer 3

Thin, transparent, protective outer covering that helps prevent microorganisms from entering the eye

Question 4

Cornea

Answer 4

Transparent front part of the eye that allows light into the eye and causes it to refract. Most refraction occurs at the cornea.

Question 5

Pupil

Answer 5

Space in the iris through which light passes

Question 6

Iris

Answer 6

Controls how much light enters the eye by changing its diameter

Question 7

Lens

Answer 7

Refracts the light towards the retina (fine tuning to focus perfectly on the retina)

Question 8

Retina

Answer 8

Contains cells that are sensitive to different intensities of light

Question 9

Optic nerve

Answer 9

Transfer to nerve impulses from the light sensitive retinal cells to the brain, via neurones.

These neurones join at the blindspot, where there are no retina cells