1. Nerves EQ: How do the basic structures of the nervous system function?

3. Nervous System Controls and coordinates all the essential functions of the body Receives and relays info about the activities within the body Reacts to internal and external change

4. Neuron Specialized to carry messages throughout the body There are 3 types of neurons –Sensory neurons: carry information from the sense organs –Motor neurons: carry information from the brain to the muscles or glands –Interneurons: connect sensory and motor neurons

6. Parts of a Neuron Synapse: space between two neurons filled with neurotransmitters to conduct nerve impulses Cell Body: performs the normal functions of the cell Dendrites: capture nerve impulses and directs them to the cell body Axon: carries nerve impulses away from the cell body Axon Terminals: end point – sends impulse to the next neuron in the path Myelin Sheath: insulates the cell – keeps the nerve impulse with in the axon

9. Threshold Messages are sent through the nervous system as electrical impulses These impulses can only move in one direction A minimum level of stimulation is required for the impulse to begin its journey: called the threshold –Below the threshold no sensation will be felt and no action taken –Above the threshold the strength of the impulse is always the same