describe the structure and function of the eye as a receptor
YOUR EYES:
Eye is in a socket in the skull, it is moved by 3 pairs of eye muscels.
At the front of the eye is a transparent cornea where light enters
It then passes through the pupil, this is surrounded by the coloured iris.
At the front of the cornea is the conjunctiva (delicate, transparent layer)
It is kept moist by the tear glands (wash your eyes when you blink)
SEEING THINGS:
light enters through the cornea, it passes through the lens and is focused on the retina.
In the retina there are cells which are sensitive to light called RODS AND CONES
When light stimulates them they send impulses to the brain along the optic nerve.
Your brain interprets the impluses and turns them into a picture.
Actually, the image on the retina is inverted, but your brain has learned to turn the picture the right way up.
Rod cells respond to dim light
cone cells respond to colour and details.
No comments:
Post a Comment