Simple description of the sense organs of the human body for 7th graders

1. Sense Organs
Based on Eunice J. B. Tenorio’s presentation
Adapted by J.C. Valverde

2. What are Sense Organs?
• They are a part of your body, such as
your eyes, nose, ears, skin, and
tongue.
• We use them to perceive the world
around us.

3. Sense of Sight
The eyes allow us to:
• see and interpret new information
• identify color
• judge depth
Fun fact:
• There are people with different colored eyes.

4. Parts of the Eye
• Cornea: the transparent window
• Pupil: where light enters the eye
• Iris: colorful part of the eye
• Lens: helps focus images onto the
retina
• Sclera: eyeball’s outer coat

5. Parts of the Eye
• Retina: changes the images into
nerve signals.
• Cones: there are 7 million color
detecting cones
• Rods: there are 120 million light
detecting rods

6. Parts of the Eye
• Retina: changes the images into
nerve signals.
• Macula: oval-shaped pigmented
area near the center of the retina
specialized in high resolution
images
• Optic Disk: optic nerve head
• Optic Nerve: connects the eye to
the brain

7. Sense of Smell
The nose allows us to:
• perceive scents
• cleans the air we breathe
• impacts the sound of our voice
Fun fact:
• The smell is connected to taste and memory.

8. Parts of the Nose
• Nostril: each hole of the nose
• Nasal Cavity: space behind the
nose
• Cilia: tiny hairs that pick up odor
molecules in the air.

9. Parts of the Nose
• Olfactory Bulb: receives neural
input about odors
• Hard Palate: Separates the nasal
and oral cavities
• Soft Palate: closes the nasal
cavity from the oral cavity when
swallowing

10. Sense of Hearing
The ears allow us to:
• listen to sounds
• perceive vibrations
Fun Fact:
• The Inner Ear is also responsible of balancing
the body.

11. Parts of the Ear
• Ear Lobe/Outer Ear: collects
sounds
• Ear Canal: sound passes
through it
• Ear Drum: transforms sounds
into vibrations

12. Parts of the Ear
• Middle Ear: transports the
vibrations to the Inner Ear
• Inner Ear: transforms vibrations
into signals for the brain

13. Sense of Taste
The tongue allows us to:
• perceive flavors
• sense the temperature of things
Fun Facts:
• The tongue is one of the strongest muscles in the
body.
• If you close your nose, you won’t be able to taste.

14. Parts of the Tongue
• The surface of the tongue is made up
of about ten thousand taste buds.
• Our taste buds detect only five
chemical stimuli: sweet, bitter, sour,
salty and umami (salts of certain acids
that are associated with savory flavors).
umami

15. Sense of Touch
The skin allows us to:
• perceive textures
• feel temperature
Fun Fact:
• It is the largest sense organ because it is located
around the entire body.

16. The Skin
• The skin can:
• sense cold, heat, contact, and
pain with different kinds of
receptors
• feel if things are bumpy,
rough, hard, soft, or smooth.
• regulate temperature by
sweating

17. The Skin
• The skin can:
• protect our body from
bacteria and fungi

18. Summary
The brain:
• receives and interprets the
information sent by the sense
organs
• takes decisions from the
information gathered by these
organs

19. SENSES
sometimes you cannot trust them