Transcript The Senses

The Senses

15-3
Vision
 How
do you see?
 Your eyes respond to the external
stimulus of light
 They
convert that stimulus into
impulses that your brain then
interprets, enabling you to see.
The Eye- how you see
Vision Problems
Nearsightedness: See nearby objects
clearly, but can’t see far away. This is
because the retina is too long and
objects don’t focus sharply on the retina.
 Farsightedness: See far away but not
things close up. The cornea is too short
and the image doesn’t focus sharply on
the retina

Myopia & Hyperopia
Hearing
 Sound
is produced by waves of
energy
 Travels
 The
through air, liquid, or solids
ear picks up sound waves,
converts them to nerve impulses
that are interpreted by the brain.
Anatomy of the Ear
The Ear & Balance
You maintain your balance because of
structures in the inner ear.
 Semicircular canals filled with fluid
makes the hair like structures inside the
canal bend. This sends impulses via
sensory neurons to the cerebellum
 The cerebellum adjusts your balance
continually to maintain your position.

Smell & Taste

Smell & taste work together

Depend on chemicals

Chemicals trigger responses in receptors
that are sent as nerve impulses to the
brain where they are interpreted as
either taste or smell
Areas of the brain for taste & smell
Touch
Not found in a specific place in the body
 Found throughout the skin
 The skin has different types of receptors

Light touch
 Heavy touch
 Pain
 Temperature change

The skin is the largest sense organ
Light touch receptors: Upper part of the
dermis, tells you when you touch
something and how things feel.
 Deep touch receptors: respond to
pressure
 Pain sensors: alert you to danger
 Temperature sensors: give you
information about your surroundings
