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Science: Chapter 18-1
What is the nervous system?
16
Science
6th Grade
02/09/2008

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Term

What is the nervous system

made up of?

Definition
  1. brain
  2. spinal cord
  3. nerves
Term
What is the job of the nerves?
Definition
  1. to carry information TO the spinal cord and brain
  2. to carry information FROM the brain and spinal cord to muscles and glands
Term

What is the control center

of your body?

Definition
your brain
Term
What protects your brain?
Definition
your skull
Term
Tell 2 facts about your spinal cord.
Definition
  1. made up of many nerves that go down your back
  2. protected by the backbone
Term

What makes up your

CENTRAL nervous system?

Definition
  1. brain
  2. spinal cord
Term
How many pairs of nerves branch out from your spinal cord?
Definition
31
Term
What is another name for a nerve cell?
Definition
neuron
Term
What is the main job of neurons?
Definition
to carry messages
Term
What are the parts of a neuron?
Definition
  1. dendrite
  2. cell body
  3. axon
Term

Describe how messages move

along a neuron.

Definition
  1. dendrite carries message TO cell body
  2. axon carries message AWAY FROM cell body
Term
What is in the cell body?
Definition
  1. nucleus
  2. cytoplasm
Term
What is a dendrite?
Definition

part of a neuron that

carries messages TO the cell body

Term
What is an axon?
Definition

part of a neuron that

carries messages AWAY FROM

the cell body

Term
What is a synapse?
Definition
a gap between the axon of one neuron and the dendrite of another.
Term
How does the message get across the gap (synapse) between neurons?
Definition
Chemicals given off by the axon carry the message across the synapse to the dendrites of the next neuron.
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