Transcript Nervous System Powerpoint

The
Nervous System
What does it do?

Is the communication and control system
of the body.
• Receives information.
• Responds to information.
• stimulus
• response
• Maintains homeostasis.
Parts of the Nervous System

Central Nervous
System (CNS)
•
•
Brain - main control of
the body - directs and
coordinates all body
processes, thoughts,
behaviors and
emotions
Spinal Cord - bundle
of nerves inside the
vertebra that carries
messages to and from
the brain.

Peripheral Nervous
System (PNS)
•

all other nerves in the
body
Autonomic Nervous
System
•
Controls the body’s
automatic function
What’s a neuron?



A message carrying cell.
Carries messages to and from the brain
and spinal cord.
Parts of a neuron:
• Dendrites- receive impulses from other
•
•
neurons and send them to the cell body.
Axons- carry impulses away from the cell
body.
Synapse- small space between two neurons.
Kinds of neurons

Sensory Neurons - pick up stimulus from
internal or external environment and
converts into a nerve impulse.

Interneuron - carries nerve impulses from
one neuron to another

Motor neuron - sends an impulse to a
muscle
What’s a nerve impulse?


The message that a neuron carries.
It is the signal that is passing through
a neuron.
What’s a reflex?

Responses to changes in the environment.

Help maintain homeostasis.
• Automatic
• Fast
• Allow rapid response to changes.
• Involve spinal cord and nerves.