Term
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Definition
cell body of a nerve
- contains nucleus |
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Term
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Definition
extend from cell body on nerve and recieve signals
- opp. side of axon |
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Term
neurons with one dendrite called:
with many called: |
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Definition
one dendrite: bipolar
many dendrites: multipolar |
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Term
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Definition
| branches off from axon of neuron. forms connection with target cell. |
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Term
| during what points is a Na+ chanel inactivated? |
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Definition
| starting from when the membrane potential reaches +35 mv until the membrane potential nears the resting value (-70 mv) |
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Term
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Definition
Resting membrane potential:
start at -70 mv, K+ inside Na+ outside.
stimulus from previous node ( bringing mem potential to - 50 mv) causes voltage-gated Na+ to open, causing Na+ gradient insdie cell (both K+ and Na+ inside cell) inside of cell now more pos than outside, meaning:
depolarization:
occurs at - 50 mv (the threshold. if reached, action potential initiated) ends at +35 mv. then:
Repolarization:
K+ diffuse out of cell until membrane potential at -90 mv. (now K+ outside and Na+ inside). Na+/K+ ATPase pumps 3 Na+ ions out and 2 K+ ions in until -70 mv reached |
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Term
| What creates the mylein sheath? |
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Definition
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Term
| describe the mylein sheaths' permiability of ions |
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Definition
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Term
| gaps in mylein sheath refered to as: |
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Definition
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Term
| rapid jumping conduction that occurs in myleinated axons refered to as: |
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Definition
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Term
| period of time where neuron is unresponsive to depolarization and thus unable to transmit another action potential. |
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Definition
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