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10 Cards in this Set
- Front
- Back
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CNS
Organs |
Brain and Spinal Cord
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PNS
Organs |
the nerves
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CNS
Function |
Sensory receptors are in organs and tissues; responds to external stimuli
Processes incoming information |
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PNS
Function |
Nerve impulses are sent to the muscles and glands
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Resting Potential
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Resting Potential axon is at rest; not conducting the nerve impulse. More NA+ outside the axon and more k+ inside the axon.
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Action Potential
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Action Potential- A change in polarity across the axonal memebrane as a nerve impulse occurs: When NA+ gates open, NA+ moves to the inside of the axon and a depolarization occurs. When K+ gates open and K+ moves to outside the axon, a repolarization occurs.
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3 Parts of a neuron
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cell body, dendrites, axons; long axons are covered by the mylin sheath
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Ion concentration
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dependant on sodium-potassium pump; NA+ ions in and K+ ions out
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Memembrane potential
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permeable to K+ not NA+ so always more ions outside
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Synapse
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When a neurotransmitter is released into a synaptic cleft, transmission of a nerve impulse occurs
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