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27 Cards in this Set

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  • Back
What does the nervous system do?
- Receives info. about what is happening inside and out of your body
-directs the way in which your body responds to the info.
-maintains homeostasis
What is a stimulus?
Any change or signal in the environment that can make an organism react
What is a response?
What your body does in reaction to a stimulus
What are neurons?
The cell sthat carry info. through your nervous system
What is a nerve impulse?
The message that a nueron carries
Does a neuron have a nucleus?
Yes
What is a dendrite?
A threadlike extension that carries impulses toward the cell body
What is an axon?
An extension that carries impulses away from the cell body
On the nueron what is the path the nerve impulse takes?
begin in dendrite>to cell body>down axon>axon tips
Can an axon have more than one tip?
Yes
Can a nueron have more than one dendrite?
Yes
Can there bemore than one saxon on a neuron?
No
What is a nerve?
a bundle of nerve fibers(axons and dendrites)
How many types of neurons are found in the body?
three
What are the three types of neurons?
Sensory, inter, and motor
What does a sensory neuron do?
It picks up stimuli from the internal and external environment and converts each stimulus into a nerve impulse
What does an internueron do?
Carries nerve impulses from one neuron to another
What does a motor neuron do?
Sends an impulse to a muscele and the muscle contracts in response
What is the order the nerve impulse travels?
Sensory neron>brain or spinal cord>interneuron>motor
What form does the nerve impulse travel along the neuron in?
electrical and chemical signals
What is a synapse?
A tiny space between each axon tip and the next structure
How does the nerve impulse cross the synapse to get to the next structure?
The axon tips release chemicals that carry the impulses accross
How many divisions of the nervous system are there and what are they?
Two:Peripheral and Central
What does the central nervous system consist of?
Brain and spinal cord
What does the peripheral nervous system consist of?
All the nerves located outside of the central nervous system
What is the central nervous system?
The control vcenter of your body?
What is the brain and where is it located?
In the skull, it is the part of the CNS that controls most functions in the body?