The nervous system functions
very quickly. It can receive
information, process it, and
respond in less then one second.
The nervous system receives
information from your five
The nervous system gathers
information. An example when
a goalie nervous system
gathers and interprets the sight
of the puck approaching and
causes his/her body by raising
his/her arm to block the shot.
The nervous system also responds to Stimuli. Responding to Stimuli is
when there is a change in an organism's environment that causes a
response. For example when a puck is approaching some people
might get ready to block it while others may get out of the way as a
response to the fear of getting hit. These reactions are ways the
nervous system enables people to respond to a stimulus in the
The nervous system also has a role in maintaining homeostasis.
Maintaining Homeostasis is the regulation of their internal
environments. For example , the goalie’s nervous system must signal
his heart and breathing to slow down to restore homeostasis once
he/she has blocked the shot.
The nervous system is divided
into two parts, the central
nervous system and the
Peripheral nervous system.
The central nervous system
(CNS) is made up of the brain
and the spinal cord. The CNS
receives, processes, stores, and
The Peripheral nervous system
has sensory neurons and
motor neurons that transmit
information between the CNS
and the rest of the body.
THE CENTRAL NERVOUS
The part of the brain that controls
memory, language, and thought is
called the Cerebrum.
The part of the brain that
coordinates voluntary muscle
movement and regulates balance
and posture is the cerebellum.
The area of the brain that controls
involuntary functions is the brain
The spinal cord is a tube-like
structure made of neurons.
Neurons, or nerve cells, are the
basic functioning units of the
THE PERIPHERAL NERVOUS
The PNS has two parts: The
somatic system and the
The somatic system controls
skeletal muscles. Neurons of
the somatic system
communicate between the
CNS and skeletal muscles.
They cause voluntary
movements, such as kicking a
The autonomic system
controls smooth muscles and
cardiac muscles. It regulates
involuntary movements such
as the beating of your heart.
The nervous system interacts
with the digestive system
because the digestive system
sends signals to the brain
, which can include being
The brain controls
behavior, muscles for
eating, and elimination of
A specific nerve called the vagus
nerve controls the pumping of the
heart, which can also be called heart
The spinal cord delivers the
messages from the brain to the rest
of the body .
The nervous system has control over
important body functions, but the
circulatory system must relay
information so that adjustments are
The most common way the Nervous System is damaged is because
of physical injuries. The injured nerves can no longer send and
receive signals. This stops communication between the CNS and
the PNS, which causes Paralysis to occur. Paralysis is the loss of
muscle function and sometimes loss of feeling. The Nervous
System can be affected by substances you take into your body such
as drugs . Drugs are chemicals that affect the body’s function. The
cause the system to slow down or speed up the communication
between neurons. Pain medications slow down this
communications so that they stop pain stimuli from reaching the
The nervous system helps maintain
homeostasis by sending messages to the
body and brain.
For example, while responding to the stimuli
of the approaching puck, a goalies nervous
system causes his heart and breathing rate to
increase . This helps him react faster.
Did you know....
There are more nerve cells in the human brain than
there are stars in the Milky Way.
If we lined up all the neurons in our body it would be
around 600 miles long.
There are 100 billion neurons in your brain alone.
The left side of human brain controls the right side of
the body and the right side of the brain controls the
left side of the body.
As we get older, the brain loses almost one gram per
There are about 13,500,00 neurons in the human
The total surface area of the human brain is about
25,000 square cm.