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Neuron 7th grade
603
Transcript
Nervous system
The nervous system enables your body to...
- respond to stimuli
- maintain homeostasis
What is the basic functional unit of this system?
A nerve cell, or neuron, is the basic unit of function.
What is the function of these cells?
These cells carry electrical messages called impulses throughout the body
How many different types of neurons are there?
There are three types of neurons
Let's see how these neurons differ?
How does an impulse travel?
impulse received by dendrites
impulse passes by cell body
impulse travels down axon
axon releases chemicals
chemicals cross synapse
chemicals attach to dendrites of next neuron
location of the nucleus
receive impulses
carries impulse away from the cell body
Function
Structure
Motor
neuron
interneuron
Sensory
neuron
- located in the eyes, ears, skin
- send impulses to the brain
- send impulses from the brain to muscles
- located in the spinal cord & brain
- connect sensory to motor neurons
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