Chapter 6 nervous system
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Created by:
malliemcneel on January 26, 2009
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19 terms
Terms | Definitions |
|---|---|
 stimuli | information in the environment that activates the nerves in a sense organ |
| nervous system | recieves and sends out info about activities within the body, monitors and responds to changes in the invironment |
| stimuli | change in the environment that causes a response |
| involuntary responses to a stumulus | increased heart rate, dialated pupils, blinking, sneezing |
| hundreds | every second _________ of messages make their journey through the body |
| can not regenerate | what is unique about a neuron? |
| cell body | part of a neuron that contains a nucleus |
| axon | part of a neuron that carries messages away from the body |
| dendrites | carries messages to cell body |
| axon terminals | ends of axons, that pass on the message to the dendrite of another neuron |
| receptors | recieves information from your surroundings |
| 3 | ___ types of neurons in the nervous system |
| sensory neurons | takes message from receptor to spinal chord and brain |
| interneuron | in brain; connects sensory neuron to motor neuron |
| motor neuron | takes message from the brain and spinal chord and to a muscle or gland cell |
| effector | the cell that is stimulated by the motor neuron |
| nerve impulse | pathway the message takes from the sensory neuron to the interneuron to the motor neuron |
| electrical; chemical | a nerve impulse travels along neurons in the form of _____ and______ signal |
| synapse | gap between 2 neurons |
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