THE FIVE
SENSES.
SIGHT
The eye is the body ´s organ for the sense of sight. The eye
is made up of the eyeball and protected by the eyebrows, eyelids and eyelashes.
When light reaches the eyeball, it goes through a hard
transparent layer called the cornea. Then it goes through the pupil which is
the opening of the iris. The light passes through the lens which focusses the
image on the retina, a layer at the back of the eye. The information gathered
by the retina travels to the brain through the optic nerve.
Difficult words:
-
Eyebrows
- eyelids - eyelashes - layer
- gather
HEARING
The ear is the body´s organ for the sense of hearing. The ear
has three parts:
-
The outer ear: it is made up of the ear and outer
auditory canal. It gathers sound.
-
The middle ear: it is made up of the eardrum and a
chain of small bones. They change sounds into vibrations.
-
The inner ear. It is made up of the cochlea and
the auditory nerve. It changes vibrations into nerve impulses that go to the
brain.
Difficult words:
-
The outer ear -Middle ear - eardrum
- Brain
TOUCH
The body´s organ for the sense of touch is the skin. The skin
has three layers:
- Epidermis: it is the outer layer. Its function is to protect.
- Dermis: It is under the epidermis. It has the receptors of
cold, heat and preasure.
- Hypodermis: It is under the dermis. It has fat that protect us
from damage or the cold.
SMELL
The body´s organ for the sense of smell is the nose. The
receptors of smell are in the pituitary, a structure inside the nostrills.
TASTE
The body´s organ for the sense of taste is teh tongue. The
receptors of taste are in the taste buds. There are receptors for different
flavours all around the tongue: salty, bitter, sour and sweet.
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