GCSE EDEXCEL BIOLOGY THE EYE

GCSE EDEXCEL BIOLOGY THE EYE

HideShow resource information
  • Created by: Hugo
  • Created on: 01-03-10 00:46
Preview of GCSE EDEXCEL BIOLOGY THE EYE

First 240 words of the document:

The Eye
Aqueous humour
a transparent watery fluid in the front part of the eye.
Conjunctiva
a thin, transparent membrane covering the inside of the eyelids and the front of
the eye.
Cornea
the transparent bulge in front of the eye. Being transparent, it allows light rays to
enter the eye. This is a continuation of the sclera. Iris- coloured part of the eye
which surrounds the pupil a continuation of the choroid. It regulates how much
light enters the eye.
Vitreous humour
transparent jelly which fills the large space behind the lens. It keeps the lens and
the retina in position and also helps in the bending of light.
Lens
a transparent disc which focuses the light on the retina.
Pupil
the hole in the middle of the iris through which light passes.
Ciliary muscle
a ring of muscle which alters the thickness of the lens do rays can be focused on
the retina. When it contracts the suspensory ligaments become slack and the lens
thickens and when it relaxes the lens becomes thinner as the suspensory
ligaments pull on the lens.
Choroid layer
the thin black middle layer containing the main arteries and of the eye. The black
pigment in this layer prevents reflection of light within the eyeball.
Sclera

Other pages in this set

Page 2

Preview of page 2

Here's a taster:

Suspensory ligaments
hold the lens in position and alter its shape in conjunction with the ciliary muscle
Fovea
also known as the yellow spot, this area has a large concentration of light
sensitive cells and so has the greatest visual ability.
Retina
the inner most layer of the wall of the eye, containing light sensitive cells.
Optic nerve
connects the eye to the brain.
Blind spot
the point at which the optic nerve leaves the eye.…read more

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all resources »