What parts of your body sense or detect changes in the environment?
What do each of these Sense Organ do
and understand how these enable humans to gather information from their surroundings
- Eye position
- Human Nose Vs other creatures noses
- The Importance of Hearing
- The effect of smell on taste
- The range of information that skin can transmit
How important Dogs Noses are to their environment
OB30 locate the main parts of the eye on a model or diagram and describe the function of the cornea, iris, lens, pupil, retina, optic nerve and ciliary muscle
Here is an image of the eye, you are expected to be able to label and explain the functions of the parts in the table below
Write out the following table
You must be able to locate the parts on a drawing of the eye,
you also need to know the functions of these parts
To witness the iris (pupil) at work, Dim the lights in a room. After a few minutes, look at the eyes of another person and note the size of the pupil (the black center spot in the middle of the eye). Turn the room lights back on. Check the size of the pupils again. The pupils should now be smaller. This is the pupillary response: it "automatically" keeps out excessive light that may damage the eye.
Where the optic nerve leaves the eye to transmit signals to the brain, leads to a blind spot in our vision
Find your blind spot
Look at the diagram below, at eye level
Close your right eye
approach the screen while always watching the cross on the right.
you can still see the ball on the left, until .... this is your blind spot where the the optic nerve leaves the eyeball
If you look at the left object close your left eye
John Dalton, man who discovered there were inner workings of the atom, had colourblindness.
A small test of colourblindness is on his wiki page.
Illusions are based on the difference between what we see and what we think we see
Here is an image of Skin