Transcript Peripheral Nervous System

The Nervous
System
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Function:
The nervous system controlls
all the functions and
movements in the body and
allows you to respond to
changes in your environment .
The Nervous System consists of two parts:
Peripheral
Nervous
System
(PNS)
Central
Nervous
System
(CNS)
Central Nervous System
•The CNS receives and interprets signals from
the PNS and also sends out signals to the
body.
•The CNS consists of the brain and spinal
cord.
Peripheral Nervous System
• The Nervous System outside the brain
and the spinal cord... all the nerves
• This includes the 5 Senses:
– Touch (Pressure and Temperature)
– Sight (Eyes)
– Hearing (Ears)
– Taste (Taste buds on Tongue)
– Smell (Olfactory Bulbs in the Nose)
Your spinal cord is made of
bundles of neurons that
carry impulses from all
parts of the body to the
brain and from the brain to
all parts of your body.
Brain Divisions:
There are three main components of
the brain, the brainstem, cerebellum
and the cerebrum.
•The Brainstem – controls the
involuntary actions of the body like
heart rate and breathing.
•The Cerebellum - Consisting of two
hemispheres, the cerebellum is
primarily concerned with movement and
balance.
•The Cerebrum – information from the
senses are interpreted and memory is
stored.
All of the different structures in
the Nervous System work
together to maintain
homeostasis.
Homeostasis
•Homeostasis describes an environment
that supports the survival of cells. All of
your body's systems work together
maintaining homeostasis inside of your
body.
•Homeostasis is achieved by making
sure the temperature, pH (acidity), and
oxygen levels (and many other factors)
are set just right for your cells to survive.
Examples of Homeostasis
Stimulus – You are hot.
Response – You sweat.
Stimulus – Your body needs fuel.
Response – Your stomach growls and
churns.
Stimulus - Bright light
Response – Closed pupils