Advertisement Upgrade to remove ads

master communicator and command center of the body

nervous system

nervous system

responsible for everything, every thought, every emotion, every movement, and every heartbeat

sensory input

monitors what's going on both inside and outside the body (includes all hearing, seeing, pain etc.)


interprets information from the sensory input and decides what to do

motor output

response in the form of messages sent to muscles, organs, or glands

receptors in your hand send a message to the brain that the stove is hot

sensory input

your brain decides that's a bad thing


your brain sends a message to your muscles to pull away

motor output


functional units of the nervous system

generates and carry impulses


supporting cells

everything else

separate and protect neurons, provide support, acts as phagocytes, and help in regulation

supporting cells

neurons and supporting cells

two basic types of cells

sensory input and integration and motor output

three main functions of the nervous system

central nervous system and peripheral nervous system

two principal divisions

central nervous system

consists of the brain and spinal cord

responsible for integrating, processing and coordinating sensory data and motor commands

central nervous system

command and control center

central nervous system

responsible for higher functions-intelligence, memory, learning, and emotions

central nervous system


off to the side

everything except the brain and spinal cord

peripheral nervous system

peripheral nervous system

provides all communication between the brain, spinal cord and the rest of the body

afferent and efferent

two functional divisions of the peripheral nervous system



division that carries sensory information from the receptors of the body to the central nervous system



receptors detect changes in the the environment--eyes, ears, touch, pain, heat, cold, etc.



division that carries motor information from the central nervous system to the body





make something happen (organs, muscles, glands)

somatic and autonomic

two parts of the efferent division

controls skeletal muscles



voluntary and involuntary (reflexes)


visceral motor system

controls cardiac and smooth muscle, organs, and glands



generally slows things down (heart rate)


generally speeds things up


controls activity within the digestive system

parasympathetic, sympathetic, enteric

sections of autonomic

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again


Reload the page to try again!


Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording