2. THE FIVE SENSE ORGANS AND THEIR FUNCTIONS
The sense organs — eyes, ears, tongue, skin, and nose — help to protect the body.
The human sense organs contain receptors that relay information through sensory
neurons to the appropriate places within the nervous system.
3. The Eyes
- Do you remember your mother or father telling you to eat yellow fruits like tiesa,
ripe mangoes and yellow vegetables like squash and corn?
- How do they remind you when you sit very close to the television set as you watch
your favorite cartoon show?
- When do they ask you not to read with poor lighting?
- Do you know that they do these so you will not hurt your eyes?
Sense organ for sight.
Very important because they enable people to see.
It helps identify the characteristics of people, things, and places
around.
4. Structure of the Eye
– protect the front part of the
eye. It automatically close when the eye
is in potential danger.
– protect the eye by keeping
dirt and other stuff from entering the eyes.
- help keep our eyes clean and
clear. They protect the eyes from perspiration and
provide shade.
– white part of the eye. It serves
as a protective coating of the eye.
– clear portion of the eye that
allows light to enter the eye. It is very
important of the eye even though you
cannot see it.
5. – a small black part opening of the eyeball where the light passes
through after entering the eye.
Pupil contracts or become smaller when it is exposed to light.
Pupil dilates or becomes larger when it is not exposed to light.
– surrounds the pupil by a colored part.
- has different color range from black to gray, brown, blue, or green.
8.
– light passes from the cornea to the pupil. It flattens when it
focuses on far objects, becomes thick when it focuses on near objects.
– part found at the back of the eye. It contains millions of
rods and cones, two kinds of cells ha tare highly sensitive to light.
– allow to see in dim or dark places, such as movie house.
– allow to see different colors.
– passageway of signals from the retina to the brain.
6. - a spheroidal structure containing sense receptors for
vision, found in all vertebrates and constructed much like a simple
camera. ... At the front of the eye, the tear film covers the
transparent cornea, the “window” through which light passes into
the eye.
- is a transparent, colorless, gel-like substance.
It helps maintain the round shape of the eye and can also help with
vision clarity and shock absorbance. With aging, the vitreous humor
undergoes vitreous degeneration, acquiring a thinner liquid
consistency.
are pupils that are larger than
normal. They are sometimes called .
The size of your pupils is controlled by tiny
muscles in the colored part of your eye (iris) and
the amount of light reaching your eyes. Your
pupils get bigger or smaller, depending on the
amount of light around you.
7. How you See
From the cornea to the pupil, the light passes through the lens, which focuses on the image of an object
that you see, The lens flatten when it focuses on far objects and becomes thick when it focuses on near
objects. The lens project the image of the object viewed upside down on the retina at the back of the eye.
It contains millions of rods and cones. The rods and cones take the light that your eye receives and
change it into nerve signals. The retina sends the signals to your brain through passageways called optic
nerves. Your brain then interprets these signals and processes the image of the object seen.
1. Wash the eyes when dust get into it. Never wash with soap.
Do not rub the eyes with hands, use a clean cloth or soft
tissue paper.
2. Eat food rich in vitamin A such as carrots, papaya, and
squash.
3. Wear glasses when you go out on sunny days.
4. Read with proper lighting.
5. Avoid reading while inside the moving vehicle.
8. 6. Sit at least three meters away from the television while watching.
7. Keep sharp and pointed objects away from the eyes.
8. Take time to rest the eyes. Avoid sleeping late at night, especially when having
class the next day.
9. When having problems in the eyes, see an ophthalmologist.
- Infection that affects the eyelid.
- Small pinkish lump that appears either on the upper or
lower eyelid.
- Caused by bacteria or by an insect bite.
- Treatment: consult an ophthal-mologist or an eye doctor in
taking antibiotics that cures infection.
9. - Inflammation of the outer
surface of the eye.
- More popularly known as
sore eyes
- Caused by an infection,
allergy, or irritation.
- It is red and inflamed.
- Treatment: use antibiotic
that must prescribed by an
ophthalmologist.
