3. Sight
• We see with our eyes
– Iris: largest part of the
eye; colored
– Pupil: centre of the
iris; black; light enters
eye through pupil
– Lens: behind pupil;
used to focus on
objects
– Retina: nerve carries
information we see to
brain
4.
5. More on Sight…
• Eyelids, eyelashes, eyebrows, and
lachrymal glands help to protect our eyes
from too much light and particles in the air
7. Hearing!
• We hear with our ears
– Ear flap & ear canal (external
ear): protected by small hairs
and wax
– Eardrum, anvil, hammer, stirrup
(middle ear): group of small
bones
– Cochlea (inner ear): sense of
balance is also located in the
inner ear
8. How We Hear
• Sounds enter the external ear
• Sounds travel through ear canal to eardrum
• Eardrum vibrates, sound travels to inner ear,
to a nerve, then to the brain
*Careful! Loud sounds can damage your ears!!
9. Find three things in the room
you can hear.
What kinds of sounds
do they make?
10. Touch
• We touch with our
fingers
• Sense of touch is in
the skin that covers
our body—especially
in our hands
– Fingerprints are the
distinct lines on our
Braille: alphabet used by fingertips
blind people; touch
letters with fingertips
11. What are adjectives for how
things feel when you touch
them?
Soft, squishy, hard, rough, wet, cold, hot…
12. Taste
• We taste with our
mouth
– Tongue: organ we use
to detect different
flavours
– Taste buds: small
bumps on tongue that
pick up flavors
Sweet, sour, bitter, salty
13. Draw 2 things that taste good
and 2 things that taste bad.
What do you think tastes good? Bad?
14. Smell
• We smell with our
nose
– Nostrils: external
openings
– Nasal cavities: internal
cavities
– Septum: separates the
nostrils and naval
cavity
15. More on Smell…
• Hairs and mucus membrane protect the nasal
cavities by filtering the air that we breathe
• Pituitary gland: helps us to detect smell; covers
nasal cavities
*Nose helps the tongue
to taste our food!!
