nerves and senses ana

NERVES AND SENSES

BY:ANA GARCIA CALDERÓN

VOLUNTARY MOVEMENTS:Our sense organ detect informationabout the enviroment and send it to the brain. Then the brain interprets the information and react. Motor

nerves transmit nerves impulses to the muscles.

INVOLUNTARY MOVEMENTS:Our sense organ detec information about the enviroment and send it to the spnal cord. It

interpretes information and reacts quickly. Motor nerves transmit the nerve impulses from the spinal

cord to muscles.

SHIGHT

Close and open the eye

Transparent layer that Protect the pupil

Small hole that lets light into the eye

It focuses light on the retina

Coloured partHas got optic cells that detect lihgt and colours, send information to the brain.

HOW DO THE EYE WORK

Light goes to the eye through pupil and lens.

Lens project 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 transmit nerves impulses to the brain.

The brain interpretesinformation.

SMELL

TASTE

HEARING Outer ear: eardrum and ear canal.

Middle ear: hammer, anvil and stirrup.(ossicles)

Inner ear: semicircular canal and cochlea.

ossicles

cochlea

Semicircularcanals

auditory nerve

HOW DO THE EAR WORK

The sound waves go into the ear canal and hit the

eardrum

Eardrum vibrate

When eardrum vibrates

transmit this vibrations to the

cochlea.

The cochlea produces nerve

impulses. Auditory nerve transmit these impulses to the

brain. Finally the brain interprets the information.

TOUCHThere 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.