TRUE OR FALSE:
You hear with your
ears, taste with your
tongue, and see with
your eyes.
Sense: Hearing
Ear Anatomy
• Pinna
– Outer ear
• Eardrum
– Amplifies sound by 3 bones: malleus, incus, stapes
• Cochlea
– Contains mechanoreceptors (measures pressure)
Sound
Transmission
1) Sound waves (vibration of the air) enters the ear canal
2) Eardrum & the small bones vibrate
3) Fluid in the cochlea vibrates
4) Hair cells in the cochlea bend
5) Impulse transmitted through the auditory nerve and to the brain
Sound Transition Animation
Sense: Vision
Eye Anatomy
• Cornea
– Protective layer of the eye
• Iris
– Colored part of the eye
– Contains muscles to open &
close the pupil
• Pupil
– Size adjusts with light
• Small: more light
• Large: less light
• Lens
– Focuses light onto the
retina
• Retina
– Back of the eye
– Contains rods & cones
• Optic Nerve
– Sends impulses to brain
Vision Process
#3
#1
• 1) Light passes through pupil
• 2) Lens focuses light onto retina
• 3) Photoreceptors (rod and cone cells) of the retina create
impulses
• 4) Impulse travels up optic nerve to brain
The shape of the cornea
can change where the
light gets focused…
that’s what causes near
or far sightedness
Read the color of the text
Read the color of the text
Cow Eye
Dissection
Sense: Smell & Taste
• Nose
– Scent chemicals dissolve
in mucus
– Impulse travels from
olfactory nerve to brain
• Tongue
– Chemicals dissolve in
saliva
– Chemoreceptors in taste
buds creates impulse
Sense: Touch (Temperature, Pain, Pressure)
• Mechanoreceptors in
skin sense pressure
– Upper layer:
gentle touches
– Lower layer: heavy
pressure
• Thermoreceptors
(temp) & Nociceptors
(pain) detect
chemicals released by
damaged cells
• Impulses sent to brain
1) Name the 5 senses.
2) Label the diagram of the eye.
3) Which eye part:
1) Protects the outer eye?
2) Contains rod and cone cells?
3) Focuses light?
4) Label the diagram of the ear.
5) Name the three bones
behind the ear drum?
6) Name the bone of the ear
that has hair cells.
7) Which sense is:
1) related to the optic nerve?
2) related to the olfactory
nerve?
3) related to the auditory
nerve?
8) Which receptors detect
temperature changes?
Review