This document discusses the senses and nervous system. It explains that sense organs like the eyes and ears detect environmental information and transmit nerve impulses to the brain or spinal cord for interpretation. The brain or spinal cord then responds by sending nerve impulses to muscles to allow for voluntary or involuntary movement. Specifically, it describes how the eye works through the pupil, lens and retina to transmit light and color information to the brain via the optic nerve. It also explains the basic anatomy and function of the ear in hearing sounds waves and transmitting signals through the ossicles, cochlea and auditory nerve.

1. NERVES AND SENSES
BY:ANA GARCIA CALDERÓN

3. VOLUNTARY MOVEMENTS:
Our sense organs detect information
about the environment and send it
to the brain. Then the brain
interprets the information and
reacts. Motor nerves transmit nerves
impulses to the muscles.

4. INVOLUNTARY MOVEMENTS:
Our sense organs detect information about the
environment and send it to the spinal cord. It
interprets information and reacts quickly. Motor
nerves transmit the nerve impulses from the spinal
cord to the muscles.

5. SHIGHT
Closes and opens
the eye
Transparent
layer that
protects the
pupil
A small hole
that lets light
into the eye
It focuses light
on the retina
Coloured part
It has got optic cells that
detect light and colours, then it
sends information to the brain.

6. HOW DOes THE EYE WORK?
Light goes into the eye
through pupil and lens.
The lens projects an upside
down image onto the retina.
The optic cells detect lights
and colours. They send nerve
impulses to the optic nerve .
The optic nerve transmits
nerves impulses to the brain.
The brain interprets
information.

7. SMELL

8. TASTE

9. HEARING
 Outer ear: eardrum and ear canal.
 Middle ear: hammer, anvil and stirrup (ossicles)
 Inner ear: semicircular canals and cochlea.
ossicles
Semicircular
canals
auditory
nerve
cochlea

10. HOW DOES THE EAR WORK?
The sound
waves go into
the ear canal
and hit the
eardrum
Eardrum
vibrates
When eardrum
vibrates it
transmits this
vibration to the
cochlea.
The cochlea
produces nerve
impulses.
Auditory nerve
transmits these
impulses to the
brain. Finally the
brain interprets
the information.

11. TOUCH
There are nerve endings in the
dermis. They detect information.
Then sensory nerves transmit
nerve impulses to the brain. The
brain interprets information.
Your skin keeps bacteria
and microbes out of your
body and it uses sunlight
to have vitamin D and to
control your body´s
temperature.