Download OUR SENSES Unit 4 - Colegio Sagrado Corazón de Linares

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When we finish unit 4 we will be able…
To identify the five senses.
To learn that our senses help us understand the
world around us.
To identify the information each sense perceives.
To learn how to protect our senses.
1. Sight
•Our eyes are sense organs that take in
light and give us light.
The eyeball is the main part of the eye.
It´s surrounded by other protective parts
that keep it safe.
In the eyeball there are five main parts: the cornea,
the pupil, the iris, the lens, and the retina.
 Pupil is the black circle in the middle of the iris. It lets
light into the eye.
 The iris is the coloured circle in the front part of the
eye. It can be green, blue or brown.
 The retina is the layer of cells inside the eye. It
captures the light and sends information to the brain.
The eyes are the sense organs of sight. Eyes are very
delicate and need protection:
 Eyelids protect the eyes by opening and closing.
 Eyebrows and eyelashes protect the eyes from dirt.
 Lacrimal glands produce tears which keep the eyes
The eyes and the brain
2. Hearing
• Hearing is the sense you use to capture
sounds. Ears are the sense organs of
• You have two ears, one on each side
of your head. This is how you know
which direction a sound is coming
from. The ears capture sound
vibrations and send them to the brain.
The ear has three parts: the outer ear, the
middle ear and the inner ear.
• The outer ear is external. It captures
sound through the ear flap or pinna. The
sound travels through the ear canal to
the middle ear.
• The middle ear is internal. It consists of
the eardrum and three small bones
called ossicles. When sound reaches the
eardrum, it vibrates.
• The inner ear is inside your head. It
consists of the cochlea. The cochlea
receives the sound vibrations.
The ear and the brain
• The sound captured by the ear is
received by the cochlea. The
cochlea sends the sound through
the auditory nerve to the brain.
• The brain interprets the
information. This is how you can
distinguish different sounds: music,
a humanvoice or a barking dog.
3. Touch
Your skin is the sense organ of
It is through our sense of touch
that we can feel different textures
or temperatures.
4. Smell
The sense organ of smell is inside your nose.
In order to capture a smell, an odour must
travel through the air, enter the nose through
the nostrils and reach the nasal cavity.
The smell receptors send signals to the olfactory
bulb in the brain. The brain interprets the
information. We can distinguish lots of
different smells.
5. Taste
The sense of taste allows you to capture
different flavours of food. The tongue is the
main sense organ of taste.
The tongue is inside the mouth. It is
covered with small bumps called taste
These taste buds distinguish four basic
flavours: sweet, salty, sour and bitter.
An apple tastes sweet, and tuna fish tastes
salty. A lemon tastes sour, and coffee tastes
Natural Science
Unit 4
Year 2016-2017