Directions: 1) WORK WITH A PARTNER TO READ AND ANNOTATE!
 Underline Key phrases, Circle words you do not understand, Break up large words into smaller words
Tasting, smelling, seeing, hearing, thinking, dreaming, breathing, heart beating, moving, running, sleeping, laughing, singing, remembering, feeling pain or pleasure, painting, writing...you couldn't do any of these things without your nervous system!
What is the nervous system?
Made up of your brain, your spinal cord, and an enormous network of nerves that thread throughout your body, it's the control center for your entire body. Your brain uses information it receives from your nerves to coordinate all of your actions and reactions.
Without it, you couldn't exist!
What are nerves?
They're the thin threads of nerve cells, called neurons that run throughout your body. Bundled together, they carry messages back and forth just the way that telephone wires do. Sensory neurons send messages from the environment to the brain, and generally connect to the brain through the spinal cord inside your backbone. Interneurons interpret the messages and decide on a response (either in the brain or spinal cord).
Motor neurons then carry messages back from the brain to all the muscles and glands in your body to act on the decided response.
So how do they pass along messages?
Through the marvels of chemistry and a kind of electricity! Neurons are thin. Some are very small, and some can be three feet long! All are shaped somewhat like flat stars which have, to varying degrees, been pulled at each end so that they have long fingers. The fingers of one neuron almost reach to the next neuron.
When a neuron is stimulated -- by heat, cold, touch, sound vibrations or some other message -- it begins to actually generate a tiny electrical pulse. This electricity and chemical change travels the full length of the neuron. But when it gets to the end of finger-like points at the end of the neuron, it needs help getting across to the next extended finger. That's where chemicals come in. The electrical pulse in the cells triggers the release of chemicals that carry the pulse to the next cell. And so on and so on and so on!
Remind you of anything?
How about a cool relay of dominoes in which one standing domino falls and trips the next and the next and the next…

Name: Date: Per
Exit Slip: CNS, PNS and Neurons
1.
List the 3 types od nerve cells:
_____________________________________________________________________________________
2.
Which nerve cell allows you to see, taste, feel and touch, and hear the environment that you are in?
3.
Which nerve cell relays messages between other nerve cells? ______________________________
4.
Which nerve cell sends messages to muscles to tell them to move? __________________________
5.
What is an axon?
6.
Complete this sequence: Sensory Neuron  Interneuron  _________________________
7.
What is the difference between the peripheral nervous system and the central nervous system?

DO NOW: Three Types of Neurons
Directions: Review your notes and DRAW a picture of the three types of nerve cells.
Sensory Neuron
(tissue AND cell)
Three Types of Nerve Cells
Interneuron
(tissue AND cell)
Motor Neuron
(tissue AND cell)
DO NOW: Three Types of Neurons
Directions: Review your notes and DRAW a picture of the three types of nerve cells.
Sensory Neuron
(tissue AND cell)
Three Types of Nerve Cells
Interneuron
(tissue AND cell)
Motor Neuron
(tissue AND cell)
DO NOW: Three Types of Neurons
Directions: Review your notes and DRAW a picture of the three types of nerve cells.
Sensory Neuron
(tissue AND cell)
Three Types of Nerve Cells
Interneuron
(tissue AND cell)
Motor Neuron
(tissue AND cell)